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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35/00
Locks for use with special keys or a plurality of keys; ; keys therefor
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E05B35/08
operable by a plurality of keys
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E05B35/10
with master and pass keys
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E05B35/105
Locks allowing opening by official authorities, e.g. master key opening of luggage locks by customs officials
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