Black and white negative of a Pall and Co. machine. Negative missing.

Black and white negative of the machines in Pall and Co. Ltd. factory. Negative missing.

Black and white negative of the apprentice for Mohawk Tools. Negative missing.

Black and white negative close-up of an Industrial Staff member. Negative missing.

Black and white negative close-up of an Industrial Staff member. Negative missing.

Black and white negative close-up of an Industrial Staff member. Negative missing.

Black and white negative close-up of an Industrial Staff member. Negative missing.

Black and white negative close-up of an Industrial Staff member. Negative missing.