Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1990-01-25
1994-01-11
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03432378
REFERENCES:
patent: 4544305 (1985-10-01), Hair
1981 Sweets publication Section 9.18/Bu p. 21 item on bottom left side of page, second tile from bottom of page illustration 10.times.10.
Clark Doris
Stebens Robert E.
Word A. Hugo
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