Building units and construction elements – Structure – Simulative
Patent
1977-03-28
1979-10-09
Word, A. Hugo
Building units and construction elements
Structure
Simulative
D25 80, D25 96, D2501
Patent
active
D02531321
REFERENCES:
patent: D25531 (1896-05-01), Spurgin
patent: 1634126 (1927-06-01), Tyra
patent: 1700138 (1929-01-01), Murray, Jr.
Lind John E.
Rolls Gerard Tile Company Limited
Word A. Hugo
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