Building units and construction elements – Structure
Patent
1978-04-17
1981-07-21
Word, A. Hugo
Building units and construction elements
Structure
D2502
Patent
active
D02599562
REFERENCES:
patent: 1877493 (1932-09-01), Brockhurst
patent: 2162499 (1939-06-01), Borhek
patent: 2514119 (1950-07-01), Bollia
patent: 3393520 (1968-07-01), Butterworth
patent: 3412561 (1968-11-01), Reid
Koenig Gloria K.
Word A. Hugo
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