Building units and construction elements – Structure – Four or more levels
Patent
1976-10-20
1978-07-11
Word, A. Hugo
Building units and construction elements
Structure
Four or more levels
D25 19, D25 31, D2503
Patent
active
D02484960
REFERENCES:
patent: 277156 (1883-05-01), Pardessus
patent: 506238 (1893-10-01), Kirker
patent: 3768016 (1973-10-01), Townsend et al.
patent: 3841039 (1974-10-01), Farnsworth
patent: 3895473 (1975-07-01), Fraser
Rosenberg Morton J.
Word A. Hugo
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