Stable L=shaped concrete slab for retaining wall - has base panel on base slab protruding rearward and form locked to it
CH580212A5
Cube-shaped concrete building-slab, for gardens - is of trapezoid cross-section, and prismatic, parallel-edged exterior, and has gripping-strips or ridges (OE150976)
CH579682A5
Concrete building-block for cavity walls - is L-shaped, with a cavity inside on the ground, and the other side at right angles to it
DE2361922A1
CONCRETE BLOCK
DE1817370A1
Concrete block for horticulture to build retaining walls for slopes
