DEVICE OF LAYING LARGE APERTURE PIPE WHILE EXPANDING ARCHED HOLE

Title:

DEVICE OF LAYING LARGE APERTURE PIPE WHILE EXPANDING ARCHED HOLE

Document Type and Number:

Japanese Patent JPS5448912

Kind Code:

A

Inventors:

MATSUO KEIJI
MIZUSAWA CHIYOUSEI
NAKAMURA SHIYOUICHI

Application Number:

JP11508077A

Publication Date:

April 17, 1979

Filing Date:

September 27, 1977

Export Citation:

Assignee:

TEISEKI SAKUSEI KOUGIYOU KK

International Classes:

E21D9/08; E02F5/18; (IPC1-7): E02D29/10; E02F5/18

Domestic Patent References:

JPS5136711A

1976-03-27

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