Patent classifications
A
HUMAN NECESSITIES
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A44
HABERDASHERY; JEWELLERY
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A44B
BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
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A44B1/18
adapted for special ways of fastening
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A44B1/28
with shank and counterpiece
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A44B1/32
Shank inserted into counterpiece and locked by sliding or rotating
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