IPIQ

PERFORMING OPERATIONS; TRANSPORTING

B21

MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

B21K

MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS

1/00

Making machine elements

B21K1/20

valve parts

B21K1/22

poppet valves, e.g. for internal-combustion engines