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Billingham; Ernest W.
Birmingham, GB
No. of patents:

Patent Number Title Of Patent Date Issued
4973209 Screw for contaminated pre-tapped holes November 27, 1990
A locking screw having a head at one end, a special entry portion at the other end, and a trilobular shank portion extending from the entry portion toward the head. The screw is further characterized in that the thread profile is of a double angle configuration symmetrical about an axis

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