Black and white negative of the front of the Progress Cleaning Machine. Negative missing.

Black and white negative of the front of the Progress Cleaning Machine. Negative missing.

Black and white negative of the Progress Building.

Black and white negative of [product] for De Beers.

Black and white negative of [product] for De Beers.

Black and white negative spares of [products] for De Beers.

Black and white negative of products for Callins.

Black and white negative of products for Callins.

Black and white negative of products for Callins.

Black and white negative of products for Callins.