Patent ID: 6490837
Filing Date: 2002-12-10
Classification: E02D

Abstract:
A block comprising:(a) a front wall; (b) a rear wall; (c) first side wall; (d) second side wall opposed to said first side wall; (e) an upper block planar surface; (f) a lower block planar surface; wherein said first side wall and said second side wall extend from said front wall to said rear wall to define a central through core extending through the block from said upper block surface to said lower block surface, and said core has an upper front rim defined by said upper block planar surface and a first front corner extending downwardly from said upper block planar surface, proximate the intersection of said first side wall and said front wall; (g) a first lug which extends downwardly from said lower block surface adjacent said first side wall, and has (A) a flat side portion flush with said first side wall and (B) a front arcuate portion which joins said first lug side surface at an angle of greater than 90Â° and has a front rim.