Roofing shingle

Details Roofing shingle Roofing shingle

1976-03-31

1978-04-25

Word, A. Hugo

Building units and construction elements

Structure

Simulative

D2501

Patent

active

D02477866

REFERENCES:
patent: D105276 (1973-07-01), Hauck
patent: 1843370 (1932-02-01), Overburg
patent: 1974047 (1934-09-01), Harshberger
patent: 2068118 (1937-01-01), Topping
patent: 2199760 (1940-05-01), Schuetz
patent: 3921358 (1975-11-01), Bettoli

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