Factory workers putting sheets of rubber into a machine, ca.1945 

Factory worker spooling rubber on a conveyor belt, ca.1945 

Factory workers placing tires into molds, ca.1930 

Worker moving packages of rubber product, ca.1945 

Three factory workers standing at a table, working with rubber, ca.1930 

Three workers unloading tires from a rail car, ca.1950 

Woman marking numbers on white rubber pads, ca.1950 

Three factory workers making beads (treads?) and working with machinery, ca.1945 

Factory worker working with large machinery, ca.1950 

Close-up of machinery in a rubber factory, ca.1945 

Factory worker standing behind a tire-production machine, ca.1930 

Three workers unloading tires from a rail car, ca.1950 

Shipment of Malay raw rubber at Los Angeles Harbor, December 1934 

Line of workers inside the Firestone Rubber Company, ca.1928 

Worker applying a tool to a clay-like material, ca.1930 

Worker laying down the first plies of a passenger car tire at the Goodyear Tire and Rubber Company's plant, ca.1930 

Mattress-making process at the United States Rubber Company, ca.1950 

Two workers loading large tires onto a railway car, ca.1950 

Multiple factory workers completing a final inspection on tires, ca.1930 

Workers pouring formic acid into tanks of latex to hasten the process of coagulation at the Goodyear Tire and Rubber Company, ca.1930