Collection processed by Gail Erwin
2012 San Joaquin County Historical Society
11793 North Micke Grove Road
Lodi, CA 95241
Phone: (209) 331-2055
Fax: (209) 331-2057
URL: http://www.sanjoaquinhistory.org/

Hahn (Stanley C.) Collection, 1933-1979

Collection number: Ms73

San Joaquin County Historical Society
Processed by:
Gail Erwin
Date Completed:
2012
Encoded by:
Leigh Johnsen
2012
San Joaquin County Historical Society. All rights reserved.

Descriptive Summary

Title: Hahn (Stanley C.) Collection
Date (inclusive): 1933-1979
Date (bulk): bulk 1935-1937
Collection Number: Ms73
Location: Erickson Vault
Extent: 1.5 linear feet
Contributing Institution: San Joaquin County Historical Society and Museum
11793 North Micke Grove Road
Lodi, CA 95240
Language of Material: Records written in English
Abstract: The materials in the collection supply a picture of the growth of an internationally successful company through the period of the Great Depression, as well as the development of the machines important to the farmers and developers in California and across the world. The collection consists of draftsman’s drawings and blueprints as well as company publications and photographs of equipment, the majority collected during the employment of Stanley Hahn with R. G. LeTourneau, Inc., an internationally respected earthmoving company. The bulk of the collection dates between the years of 1935 and 1937, when Hahn was employed by LeTourneau, and includes related items connected to that company and collected in subsequent years. The collection includes additional items from Hahn’s employment between 1936 and 1943 with Capps Brothers, steel fabricators and machinery builders in Stockton, California.

Access Information

Collection is open for research by appointment.

Conditions of Use

The library can only claim physical ownership of the collection. Users are responsible for satisfying any claimants of literary property.
Preferred citation: [Item name], Stanley C. Hahn Collection, Ms73, San Joaquin County Historical Society and Museum, Lodi, California.

Related Material

Title: Agricultural Technology Manuals,
Date (inclusive): 1893-2000 (Ms81)
Title: Kerr (Andrew C.) Collection,
Date (inclusive): 1927-1939 (Ms80)

Biography

Stanley C. Hahn (1908-2008) graduated from Stockton High School in 1929 and took his first full-time job with R. G. LeTourneau, Inc., as a draftsman. Known as the “Dean of Earthmoving,” Robert G. LeTourneau (1888-1969) established R. G. LeTourneau, Inc., in 1929, combining a contracting business with the manufacture of earthmoving equipment. By 1933, the company dropped out of contracting altogether to concentrate on the manufacturing side of the business. Working with other draftsmen, Hahn created blueprints for numerous machines designed for heavy earthmoving projects. When the company moved its main offices in 1935 to Peoria, Illinois, Hahn relocated briefly to Sunnyvale, California, where he worked for the Wooldridge Company. He returned to Stockton the following year and was employed by Capps Brothers, steel fabricators and machinists. Capps Brothers had bought the rights to the Laurence L. Miller Almond Huller, and Hahn created blueprints detailing the huller. He also worked on projects constructing parts for the Holt Combine and for Stevens Boat Works, in Stockton, California.
In 1943, Stanley Hahn and his wife Lydia bought the H and M Tractor Company in Stockton, renaming it the Hahn Tractor Company. The focus of the business at that time was manufacturing equipment. In 1945, Hahn partnered with Ashley Mehrten to devise and fabricate the first rice combine in the San Joaquin Valley. Soon after, Hahn established the first Oliver tractor dealership in the Northern San Joaquin Valley. Though manufacturing remained its focus, the company added a tractor repair and parts division and eventually a rental fleet to its ventures.

Scope and Content

The Stanley C. Hahn Collection consists of papers from the files of Stanley Hahn, a mechanical draftsman, who began his career with R. G. LeTourneau, Inc. The bulk of the collection dates between the years of 1935 and 1937, when Hahn was employed by LeTourneau. It also includes items from his employment in 1936-1943 with Capps Brothers, steel fabricators and machinery builders in Stockton, California. The collection contains original draftsmen’s drawings and blueprints, administrative records and sales information, newsletters and newspaper articles, price lists, parts catalogs, company informational binders, and photographs. Of particular interest are the original draftsman’s materials showing the details of machinery development. Also of interest are copies of salesgrams and two series of different LeTourneau newsletters illustrating the inner workings of the company.

Arrangement

The collection consists of four series: 1. Original Materials by Stanley C. Hahn, 2. Publications of R. G. LeTourneau, Inc., 3. Photographs, and 4. Oversize.

Access Points

Personal Name

Hahn, Stanley C. (1908-2008)

Corporate Names

Caterpillar Tractor Company
R. G. LeTourneau, Inc.
Hahn Tractor Company

Subjects

Tractor Industry--United States
Caterpillar Tractor Company--History
LeTourneau, Robert G. (Robert Gilmore), 1888-1969


Collection Contents

 

Series 1 Hahn Family Papers 1934-1941

Scope and Content Note

Includes Hahn family greeting cards, correspondence, and ephemera, as well as draftsman's drawings and blueprints by Stanley Hahn in company with others employed by R. G. LeTourneau and work done by Hahn on Capps Brothers' Almond Huller.
Folder 1

Correspondence and Ephemera, 1935-1940

Folder 2

Power Control Units and LeTourneau Stockton Iron Works, 1934-1938

Folder 3

24 Yard Buggy, 1934-1935

Folder 4

Almond Huller Drawings by S. Hahn (1 of 2), 1936

Folder 5

Almond Huller Drawings by S. Hahn (2 of 2), 1936

Folder 6

Almond Huller, 1937-1938

Folder 7

Almond Huller, 1937-1941

 

Series 2 Publications of R. G. LeTourneau, Inc. 1934-1979

Scope and Content Note

Includes administrative items and sales information, newsletters and newspaper articles, price lists, parts catalogs, and items from company informational binders.
Folder 8

General Company Information, 1936-1938

Folder 9

Information for Salesmen: Promotional Material, Memos, and Salesgrams, 1934-1938

Folder 10

LeTourneau Indexes, Undated

Folder 11

Promotional Pamphlets, 1935-1939

Folder 12

Believe-All, Stockton, 1936-1941

Folder 13

Tournapulls, 1939-1942

Folder 14

Power Control Units, 1936-1941

Folder 15

LeTourneau Scrapers, Peoria and Stockton, 1935-1938

Folder 16

Parts Price List and Part Number Cross Reference, 1937-1938

Folder 17

LeTourneau Price List Updates for Salesmen, 1935-1938

Folder 18

LeTourneau Equipment Parts Catalog, 1936

Folder 19

Parts Catalogs-Carry-all Scrapers, Ca. 1936

Folder 20

Parts Catalogs-Power Control Units, Ca. 1936

Folder 21

Parts Catalogs-Bulldozer, Ca. 1936

Folder 22

Parts Catalogs-Angledozer, Ca. 1936

Folder 23

Scrapers: Types U, Y, J, R5, 1935-1938

Folder 24

Bulldozer, 1936-1938

Folder 25

Angledozer, Power Control Unit, Logger, 1935-1938

Folder 26

Equipment Price Lists, Sheep's Foot Roller, Buggy, Rooter, 1935-1941

Folder 27

Crane, Trailer, Miscellaneous, 1935-1938

Folder 28

Promotional Pamphlets, Now Newsletters, 1934-1942

Folder 29

Promotional Pamphlets, Now Newsletters, 1935-1941

Folder 30

Promotional Pamphlets, Now Newsletters, 1934-1937

Folder 31

Newsletters- LeTourneau News, 1935-1936

Folder 32

Newspaper Articles, 1933-1937

Folder 33

Newsletters-LeTourneau College Now, 1966-1979

Folder 34

Caterpillar Diesel-35 Tractor Pamphlet, 1948-1975

 

Series 3 Photographs 1934-1942

Scope and Content Note

Includes photographs and negatives of equipment and personnel.
Folder 35

Photographs and Negatives (1 of 3), 1934-1942

Folder 36

Photographs and Negatives (2 of 3), 1935-1941

Folder 37

Photographs and Negatives (3 of 3), 1934-1937

 

Series 4 Oversize 1934-1942

Scope and Content Note

Includes plans, pamphlets, and other publications separated from Series 1 and 2.
Folder 38

J6 and J8 Scrapers, 1935

Folder 39

J12 Scraper (Universal Joint) and R5 Drag Scraper, 1934

Folder 40

U18 Scrapers, Stockton-made, 1936

Folder 41

Roe Welder made by R. G. LeTourneau, 1936

Folder 42

Power Control Units, 1936-1939

Folder 43

LeTourneau Stockton Iron Works, 1936

Folder 44

Bulldozers, A-Frames, R5 Drag Scrapers, 1936

Folder 45

24 Yard Buggy, 1934-1935

Folder 46

Almond Huller Drawings by S. Hahn, 1936

Folder 47

Almond Huller, 1937-1938

Folder 48

Almond Huller, 1937-1941.

Folder 49

General Company Information, 1936-1938

Folder 50

Information for Salesmen: Promotional Information, Memos, and Salesgrams, 1934-1938

Folder 51

Promotional Pamphlets, 1935-1939

Folder 52

LeTourneau Price List Updates for Salesmen, 1935-1938

Folder 53

Bulldozer, 1936-1938

Folder 54

Angledozer, Power Control Unit, Logger, 1935-1938

Folder 55

Equipment Price Lists, Sheep’s Foot Roller, Buggy, Rooter, 1935-1941

Folder 56

Crane, Trailer, Miscellaneous, 1935-1938

Folder 57

Promotional Pamphlets, Now Newsletters, 1934-1942

Folder 58

Newsletters-LeTourneau News, 1935-1936