PERMACRETE

PRE-FORMED CONCRETE STRUCTURAL UNITS-NAMELY, RAILROAD CROSSING SLABS; RAILROAD CROSS-TIES; FENCE POSTS; MILE POSTS; ELEVATION POSTS; SIGNAL POSTS; FOUNDATION ELEMENTS; RETAINING WALLS; CRIBBING MARKERS; LINTELS; STEPPING STONES; BUILDINGS FOR HOUSING TELEPHONES, ELECTRICAL RELAYS AND BATTERIES; FLOOR SLABS; ROOF SLABS; BURIAL VAULT CRYPTS; WINDOW AND DOOR SILLS; AND PERMANENT RIGHT-OF-WAY MONUMENTS