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A & W Deep-Well Drilling, Inc. Patents
A & W Deep-Well Drilling, Inc.
Lewiston, ID
No. of patents:

Patent Number Title Of Patent Date Issued
3952819 Fatigue resistant anvil bit for percussion rock drill April 27, 1976
A fatigue resistant anvil bit is described for use on a percussion rock drill. The anvil bit has a shank having a substantially uniform cross section terminated in a threaded end portion. A bit head is threadably mounted on the end portion having a diameter substantially greater than

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