Document Type and Number:
Japanese Patent JPH01139932
Kind Code:
U
Application Number:
JP3602388U
Publication Date:
September 25, 1989
Filing Date:
March 17, 1988
Export Citation:
International Classes:
B24B21/04; B21D31/00; E04C2/08; (IPC1-7): B21D31/00; B24B21/04; E04C2/08
Domestic Patent References:
| JPS508139B1 | 1975-04-02 | |||
| JPS6272440A | 1987-04-03 |