Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21G
MAKING NEEDLES, PINS OR NAILS OF METAL
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1/00
Making needles used for performing operations
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B21G1/006
Special treatments of pins or needles, e.g. annealing, straightening
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