发明授权
US5098234A Hollow drill for fabric and the like 失效
用于织物的空心钻等

Hollow drill for fabric and the like
摘要:
A hollow drill for fabric and the like is comprised of a hollow shaft having highly polished inside and outside surfaces and an outside diameter of preferably not more than 0.130 inches. A tip having a larger outside diameter and smaller inside diameter is brazed or soldered to the shaft. The shaft is made by a continuous manufacturing method such as extrusion and the tip is machined or molded followed by finish machining.
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