Combined crank handle hub and window sill

Building units and construction elements – Prefabricated unit – Closure

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D03436918

REFERENCES:
patent: 2581215 (1952-01-01), Stewart
patent: 2731117 (1956-01-01), Abelson
patent: 2792090 (1957-05-01), Ware, Jr.
patent: 4837977 (1989-06-01), Mauro

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