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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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E05D
HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
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13/00
Accessories for sliding or lifting wings, e.g. pulleys, safety catches
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E05D13/10
Counterbalance devices
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E05D13/12
with springs
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E05D13/1207
with tension springs
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