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Patent classifications
E
FIXED CONSTRUCTIONS
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E05
LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
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E05B
LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
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37/00
Permutation; or combination; locks; Puzzle locks
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E05B37/0003
preventing detection of the combination
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E05B37/001
through listening or feeling
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