Building units and construction elements – Structure
Patent
1977-05-23
1979-05-15
Word, A. Hugo
Building units and construction elements
Structure
D25 17, D25 18, D25 33, D2503
Patent
active
D02518546
REFERENCES:
patent: D216959 (1970-03-01), Heiser
patent: 2992649 (1961-07-01), Swallow
patent: 3190300 (1965-06-01), Wearn
patent: 3217722 (1965-11-01), Heise
patent: 3563257 (1971-02-01), Cummins
Woodard Harold R.
Word A. Hugo
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