Abstract: A concrete retaining wall block including a void configured to receive a portion of stabilizing material. The surface of the void configured to have a reduced friction where contacting the stabilizing material. The reduced friction reducing the abrasion between the concrete retaining wall block and the stabilizing material.

Abstract: A chain link comprising a shank portion connected to a pair of eye portions at each end of the shank so as to form a dog-bone shape with eyelets at the ends. The eyelets are formed by a Y-shaped root section that is connected to a half-torus-shaped hat section. The cross-section profile of the shank portion is round, square, or, alternatively, an I-beam shape. The eye portions include an inner portion having an arcuate inner surface and an outer portion being substantially rectangular in cross-section. The chain link is preferably made of a high-strength alloy steel and is especially well-suited for use in dragline hoist chains.

Abstract: A lock system removably connects an earth-engaging tooth point to an adapter. The forward-extending nose of the adapter fits within the rear-facing socket of the tooth point. A pair of opposing sides of the socket defines coaxial apertures. The adaptor has a hole through opposing sides. A locking pin is inserted into the apertures and the hole, thus fixedly connecting the tooth point to the adapter. The locking pin is retained by a keeper situated in an annular groove within one of the apertures.

Abstract: An elongated chain link comprising a pair of opposing U-shaped end portions connected by a pair of parallel leg portions. The leg portions are connected to each other by a pair of crosswise tie-bars situated toward the end portions approximately equally offset from the cross-axial centerline of the link. Additional crosswise tie-bars may be added to prevent the legs of the link from collapsing together when a large side-load is applied to the link. The leg portions are substantially square in cross section, while the end portions comprise an inner portion having an arcuate inner surface and an outer portion being substantially rectangular in cross-section. The chain link is preferably made of a high-strength cast alloy steel and is especially well-suited for use in dragline drag and hoist chains.