| http://www.w3.org/ns/prov#value | - on the body generally axially to the extended position for interlocking to substantially prevent movement of the guard back toward the retracted position; wall means defining an elongated channel on one of said body and said guard and a rib on the other of said body and said guard receivable in said channel; and said retaining means including a portion of said rib and an interlocking member carri
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