Blackwelder Manufacturing Co. Records.

Collection Number: D-326

Business records, correspondence, photographs, patent information, manuals, bills of material, drawings, blueprints, and specifications.

123.9 linear feet


Manufacturing firm located in Rio Vista, California since 1902 whose work focused on the development of tomato harvesters and other agricultural equipment.

Inclusive Dates



Agricultural Technology

Additional Collection Information

Finding Aid on the Online Archive of California
View digitized films from the Blackwelder Manufacturing Records on the Internet Archive
Blog post about the collection


Most collections are stored offsite and need to be retrieved for your research visit. To begin the request process, researchers should request boxes via the Special Collections Request System (Aeon) at least seven business days before visiting. Please check your Aeon account to confirm that the item status is listed as “Available in Reading Room” before visiting.