Assertion: traction cleat | /r/HasProperty | manufactured by drop-forging
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Source sentences:
text: The traction cleats may be made of hard rubber, steel, iron, other ferrous and nonferrous metals and polymeric material such as nylon, etc. and can be manufactured by any conventional method such as molding for the hard rubber and polymeric material, and rolling, stamping, casting or drop-forging of the metals.