copper alloys; copper alloys containing copper, nickel, silicon, and chromium; rods and tubes made of copper alloys; rods and tubes made of copper alloys containing copper, nickel, silicon, and chromium

'alloy':2,4,17,24 'chromium':10,30 'contain':5,25 'copper':1,3,6,16,23,26 'made':14,21 'nickel':7,27 'rod':11,18 'silicon':8,28 'tube':13,20

engineering design services; product development and engineering services for others

'design':2 'develop':5 'engin':1,7 'other':10 'product':4 'servic':3,8

Piston rings, automotive valve guides, and valve seats; Piston rings, automotive valve guides, and valve seats made from copper alloys; Piston rings, automotive valve guides, and valve seats made from copper alloys containing copper, nickel, silicon, and chromium

'alloy':20,32 'automot':3,11,23 'chromium':38 'contain':33 'copper':19,31,34 'guid':5,13,25 'made':17,29 'nickel':35 'piston':1,9,21 'ring':2,10,22 'seat':8,16,28 'silicon':36 'valv':4,7,12,15,24,27

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