H-Shaped window frame member

Building units and construction elements – Structure – Simulative

Patent

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Details

D2501

Patent

active

D02669536

REFERENCES:
patent: D251133 (1979-02-01), Bancroft et al.
patent: D251444 (1979-03-01), Bancroft et al.
patent: 4175357 (1979-11-01), Goldhaber

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