REMOVE

1. service stations
2. plants
3. machinery
4. Visual Works (hierarchy name …

WHAT

1. black-and-white film (1)
2. buildings (structures) (1)
3. exterior views (1)
4. fences (1)

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WHEN

1. 1920 (1)
2. 1940 (1)
3. between 1920 - 1940 (1)