Recreational surface block

Details Recreational surface block Recreational surface block

1996-03-06

1998-11-17

Bullock, B. J.

Building units and construction elements

Architectural stock material

Construction block or brick type

2501

Patent

active

D04013557

REFERENCES:
patent: D124562 (1941-01-01), Schwartz
patent: D125000 (1941-02-01), Kivelson
patent: D125106 (1941-02-01), Kivelson
patent: 3908059 (1975-09-01), Prince
patent: 4116909 (1978-09-01), Muller
patent: 4386179 (1983-05-01), Sterling
patent: 4481323 (1984-11-01), Sterling
patent: 4622257 (1986-11-01), Thompson
patent: 5234738 (1993-08-01), Wolf
patent: 5252664 (1993-10-01), Thompson et al.
patent: 5411352 (1995-05-01), Eren

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