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Westinghouse duct sizing calculator

1965
Circular slide rule (two cardboard discs with radial transparent plastic cursor) by General Industrial Co.1788 Montrose, Chicago 13,Illinois, also marked Slide Chart Corp., 1959, Perrygraf, Marywood, Illinois

Circular slide rule (two cardboard discs with radial transparent plastic cursor) by General Industrial Co.1788 Montrose

1959-1960