Title:
METHOD OF FORMING NUMEROUD FINE GROOVES ON INSIDE OF PIPE
Document Type and Number:
Japanese Patent JPS5261158
Kind Code:
A
Inventors:
OCHIAI IZUMI
Application Number:
JP13717475A
Publication Date:
May 20, 1977
Filing Date:
November 17, 1975
Export Citation:
Assignee:
HITACHI LTD
International Classes:
B21C37/20; B21D17/00; B21D53/06; B21H7/18; (IPC1-7): B21C37/20; B21D53/06; B21H7/18