Title:
DISPLACEMENT DETECTOR FOR PROPELLING CONSTRUCTION PROCESS
Document Type and Number:
Japanese Patent JPS5482810
Kind Code:
A
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Inventors:
ICHIHARA KENICHI
HIROHATA MASANORI
HIROHATA MASANORI
Application Number:
JP15035777A
Publication Date:
July 02, 1979
Filing Date:
December 13, 1977
Export Citation:
Assignee:
TONE BORING CO
International Classes:
E21B7/04; E21B7/00; E21D9/093; (IPC1-7): E02D29/10; E21B7/00
Domestic Patent References:
| JPS4317341Y1 | 1968-07-18 |