04102414 is referenced by 1 patents and cites 6 patents.

A drilling apparatus adapted to have a drill string releasably secured thereto and including improved means for selectively locking such a drill string against axial rotation.

Title
Drilling apparatus
Application Number
5/712622
Publication Number
4102414
Application Date
August 9, 1976
Publication Date
July 25, 1978
Inventor
James F Ordway
West Lebanon
NH, US
Edward A Bailey
Newport
NH, US
Agent
J Stewart Brams
Assignee
Joy Manufacturing Company
PA, US
IPC
E21B 19/00
B25B 23/00
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