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Detachable Drill-Bit.
Patent for a new invention in drill-bit machine which can be detached from two different sides and very flexible for use.
Date:
May 23, 1916
Creator:
Sly, Charles
System:
The Portal to Texas History
Load-Indicating attachment for drilling-rigs
Patent for the invention is to provide a character to be attached on a mounted on the derrick of a drilling rig and which will accurately indicate the cooperative weight of the load attached to the back of rig.
Date:
May 16, 1916
Creator:
Hughes, Howard R.
System:
The Portal to Texas History