File:A.P.A. Building. The inventor demonstrates the detail of a new steel frame demountable window for cleaning, Nov. 1937, by Sam Hood (8966277400).jpg
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![File:A.P.A. Building. The inventor demonstrates the detail of a new steel frame demountable window for cleaning, Nov. 1937, by Sam Hood (8966277400).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/A.P.A._Building._The_inventor_demonstrates_the_detail_of_a_new_steel_frame_demountable_window_for_cleaning%2C_Nov._1937%2C_by_Sam_Hood_%288966277400%29.jpg/451px-A.P.A._Building._The_inventor_demonstrates_the_detail_of_a_new_steel_frame_demountable_window_for_cleaning%2C_Nov._1937%2C_by_Sam_Hood_%288966277400%29.jpg?20160908154859)
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