Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1989-01-05
1991-08-20
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03193160
REFERENCES:
patent: D284308 (1986-06-01), Risi et al.
patent: 4197009 (1980-04-01), Lundberg
Valkenburg Johannes
van der Spek Ferdinand P.
Van Weerden Jan
Clark Doris
Lehnhardt Susan K.
Word A. Hugo
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