Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1994-11-17
1996-02-20
Clark, Doris
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03673294
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patent: 4018018 (1977-04-01), Kosuge
patent: 4860505 (1989-08-01), Bender
Nelson Larry D.
Olsen Randy M.
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