Title:
Machine for constructing lined ducts through rock
United States Patent 3379024
US Patent References:
/1320144.html
- - 1320144

Drill
- - 1574040

/0360959.html
- - 0360959

/0512037.html
- - 0512037

/0517808.html
- - 0517808


Inventors:
Maria, Wohlmeyer
Helmut, Wohlmeyer
Helga, Wohlmeyer
Anna, Berger
Hans, Waber
Publication Date:
04/23/1968
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Primary Class:
405/146
Other Classes:
299/31, 299/59, 299/56, 405/148, 405/143, 299/33
International Classes:
E21D9/08
US Patent References:
0551042
1146477
1501093Coal-cutting machine
2466709Tunneling machine
3232062Tunnel-lining machines
RE26132
Foreign References:
GB443158A
DE620764C