Building units and construction elements – Architectural stock material – Construction block or brick type
Patent
1989-02-22
1990-12-11
Word, A. Hugo
Building units and construction elements
Architectural stock material
Construction block or brick type
Patent
active
D03128814
REFERENCES:
patent: D28670 (1898-05-01), Thomas
patent: D888530 (1908-05-01), Pugh
patent: 3947192 (1976-03-01), Rosenberger
patent: 4128357 (1978-12-01), Barth et al.
patent: 4544305 (1985-10-01), Hair
patent: 4583341 (1986-04-01), Barth et al.
Kusel-form, Hermann Kusel GmbH, 1987, pp. 77 and 79, product catalog.
Clark Doris
Word A. Hugo
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