Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1990-12-17
1993-05-11
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
D21108
Patent
active
D03355420
REFERENCES:
patent: D233678 (1974-11-01), Harvey
patent: 301158 (1884-07-01), Ravenscroft
patent: 1723500 (1929-08-01), Campbell
patent: 1894584 (1933-01-01), Fort
patent: 2351768 (1944-06-01), Kaping
patent: 3139698 (1964-07-01), Arnold
patent: 4875803 (1989-10-01), Scales
Clark Doris
Dykas Frank J.
Korfanta Craig M.
Pedersen Ken J.
Word A. Hugo
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