Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21K
MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
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5/00
Making tools or tool parts, e.g. pliers
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B21K5/02
drilling-tools or other for making or working on holes
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B21K5/04
twisting-tools, e.g. drills, reamers
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