Patent classifications
D
TEXTILES; PAPER
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D01
NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
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D01H
SPINNING OR TWISTING
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7/00
Spinning or twisting arrangements
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D01H7/02
for imparting permanent twist
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D01H7/52
Ring-and-traveller arrangements
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D01H7/58
with driven rings; ; Bearings or braking arrangements therefor
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