Retaining wall block

Details Retaining wall block Retaining wall block

1994-06-13

1995-10-31

Clark, Doris

Building units and construction elements

Architectural stock material

Construction block or brick type

Patent

active

D03637875

REFERENCES:
patent: D343461 (1994-01-01), Powell
patent: 4229123 (1980-10-01), Heinzman
patent: 4920712 (1990-05-01), Dean, Jr.
patent: 5294216 (1994-03-01), Slevert
"Light in the Hand . . . Heavy in the Wall" Brochure, 2 Pages, by Stonewall Retaining Wall Systems and Westblock Products, Inc. 1991.
"PISA II Interlocking Retaining Wall System" Brochure, 2 Pages, by PISA II and RISI Stone Ltd. 1988.
"PISA II Interlocking Retaining Wall System for Garden Landscaping" Brochure, 2 Pages, by PISA II and RISI Stone Ltd. 1984, 1985.
"Interlocking Retaining Walls From RISI Stone" Brochure, 2 Pages, by Rothbury Investments Ltd. and RISI Stone Ltd. 1989.

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