| http://www.w3.org/ns/prov#value | - Upon the under side of the top piece, B, is a hub of approximately circular form, which enters the opening A', and in this example of my invention, said hub is composed of two pieces, G, of segmental form, which t against the side of the opening A', and are inclined or beveled to correspond thereto, and a wedge, O', which lits between the segments O and'is tongued and grooved into their inner edge
|
