Hatch

Building units and construction elements – Prefabricated unit – Closure

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D03483169

REFERENCES:
patent: D283548 (1986-04-01), Naka
patent: 2141481 (1938-12-01), Mattingberg
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patent: 4593493 (1986-06-01), Naka et al.
patent: 4665653 (1987-05-01), Franz et al.
patent: 4846089 (1992-07-01), Cedergreen

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