Building units and construction elements – Structure – Simulative
Patent
1977-05-16
1979-09-18
Word, A Hugo
Building units and construction elements
Structure
Simulative
D25 80, D25 87, D25 97, D2501
Patent
active
D02529513
REFERENCES:
patent: 1751272 (1930-03-01), Forman
patent: 3305982 (1967-02-01), Steele
patent: 3427774 (1969-02-01), Curtis
Frease Joseph
Word A Hugo
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