| http://www.w3.org/ns/prov#value | - A lock and key as defined in claim 2 in which said front tumblers have key-engaging forward edges which are at least as wide as said key,said sets of tumblers including opposing sets, and means in said cylinder adjacent said tumblers for preventing a lock-picking tool from passing the said opposing sets of tumblers except between the front tumblers. 5.
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