Combined building wall and door unit

Building units and construction elements – Prefabricated unit – Closure

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D25 80

Patent

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D02827824

REFERENCES:
patent: 2889586 (1959-06-01), Akerberg
patent: 3054481 (1962-09-01), Johnson et al.
patent: 3731443 (1973-05-01), Zaroor
patent: 4080769 (1978-03-01), Borghi

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