| http://www.w3.org/ns/prov#value | - A material other than plywood, of at least equivalent strength and durability, may be used for the manufacture of the heads.(2) At least two-ply plywood must be used for the body and at least three-ply plywood for the heads; the plies must be firmly glued together, with their grains crosswise.(3) The body and heads of the drum and their joints must be of a design appropriate to the capacity of the
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