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William R. McGinnis Patents |
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Inventor: McGinnis; William R.
Address: St. Petersburg, FL
No. of patents: 1
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 4406336 |
Drilling bit |
September 27, 1983 |
| The device described herein comprises a bit for drilling oil wells, water wells, foundation sockets for bridges and buildings, air and utility shafts for mines, etc., which bit comprises an inner core or mandrel and an outer shell or exterior sleeve, which shell or sleeve is replaceable |
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