METHOD OF MANUFACTURING POROUS RISER INSULATING SLEEVE
United States Patent 3470276

Inventors:
Ohno, Atsumi
Publication Date:
09/30/1969
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Assignee:
SEKISUI SUPONJI KOGYO KK
Primary Class:
264/44
Other Classes:
501/82, 164/53, 106/38.220, 249/106
International Classes:
B22D7/10; B22D7/00; B28B21/02
Foreign References:
GB627678A
GB852377A




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