Title:
Combined mine drill, timber jack, and mine post
United States Patent 2556357
US Patent References:
/0685011.html
- - 0685011

/0689766.html
- - 0689766

/0861373.html
- - 0861373

/0965024.html
- - 0965024

/0977734.html
- - 0977734


Inventors:
Baldwin, John C.
Publication Date:
06/12/1951
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Assignee:
Baldwin, John C.
Primary Class:
173/35
Other Classes:
173/42, 248/354.400, 248/200.100, 173/36, 254/13, 173/145
International Classes:
E21B15/00; E21D15/24; E21D15/00
US Patent References:
1189901
1450709Column or support for rock drills
1514262Mine jack
1524711Drill support
1776439Adjustable shore
1937547Screw thread device
2532168Mine roof and timbering jack
Foreign References:
FR372509A
GB190926630A
AU114575B