Title:
ROCK BED EXCAVATION FOR FOUNDATION WORK AND ROCK BED CRUSHING HAMMER
Document Type and Number:
Japanese Patent JPS5664082
Kind Code:
A
Inventors:
KITANAKA KATSUMI
Application Number:
JP13933379A
Publication Date:
June 01, 1981
Filing Date:
October 30, 1979
Export Citation:
Assignee:
KITANAKA KATSUMI
International Classes:
E21B1/04; E21B1/02; (IPC1-7): E21B1/02
Domestic Patent References:
| JPS5326402A | 1978-03-11 |