Building door unit

Building units and construction elements – Prefabricated unit – Closure

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D25 80

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D02887185

REFERENCES:
patent: 2889586 (1959-06-01), Akerberg
patent: 3054481 (1962-09-01), Johnson et al.
patent: 3263379 (1966-08-01), Cisco
patent: 3408779 (1968-11-01), Allen et al.
patent: 4080769 (1978-03-01), Borghi
patent: 4532915 (1985-08-01), deRham

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