Tunneling machine
United States Patent 2466709
US Patent References:
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Inventors:
Karr, Richard D.
Publication Date:
04/12/1949
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Assignee:
Karr, Richard D.
Primary Class:
405/143
Other Classes:
175/348, 175/96, 299/58, 175/171, 405/146, 175/375, 175/404, 299/81.100
International Classes:
E21D9/06; E21D9/08; E21D9/11; E21D9/10
US Patent References:
1320144
1453620Stone-drilling machine
1523912Disk for rotary-drill bits
1674870Tunneling machine
1720195Excavating device
1882545Rotary drill bit
2034072Core drill
2061657Well bit
2124521Deep well drill bit
2217292Liner segment
Foreign References:
GB188202002A