Patent Case File No. 2,298,194, Birdproofing, Inventor- Frederick W. Caldwell. -  - 74c301010ed26c59dcbf62dd3cb26c47 (page 52)

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Patent Case File No. 2,298,194, Birdproofing, Inventor- Frederick W. Caldwell. - - 74c301010ed26c59dcbf62dd3cb26c47 (page 52)

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