Black and white negative of men at work, special for Gow-Mac.

Black and white negative spares of men at work, special for Gow-Mac.

Black and white negative of a graph for SRS. Negative missing.

Black and white negative spares of a graph for SRS. Negative missing.

Black and white negative of the ground excavation for a building.

Black and white negative of the ground excavation for a building.

Black and white negative of the ground excavation for a building.

Black and white negative of the ground excavation for a building.

Black and white negative of the ground excavation for a building.

Black and white negative a group around the machine from Pink's Factory. Negative missing.