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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E05B37/20
Puzzle locks; , e.g. of labyrinth type; Fasteners with hidden or secret actuating mechanisms
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