Title:
【発明の名称】二層管及びその製造方法
Document Type and Number:
Japanese Patent JP2511712
Kind Code:
B2
Inventors:
TAKASO MASASHI
Application Number:
JP30005789A
Publication Date:
July 03, 1996
Filing Date:
November 17, 1989
Export Citation:
Assignee:
SUMITOMO METAL IND
International Classes:
B23K20/04; B21C37/06; B32B1/08; B32B15/04; (IPC1-7): B21C37/06
Domestic Patent References:
| JP1233012A | ||||
| JP1234679A |
Attorney, Agent or Firm:
Tono Kono