| http://www.w3.org/ns/prov#value | - for sliding entry into the channel of another holder and including outwardly disposed, marginal shoulders to underlie the shoulders thereof, at least one face of said support including a series of laterally spaced attaching means complemental to one type of attaching means of said holder end walls, the attaching means of both types including portions engageable to limit the extent to which intere
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