Stevens, Davis, Miller & Mosher
Method for producing special pipes having longitudinally extending diaphragm partitions
 A method for producing a pipe, preferably of thermoplastic comprising a tubular body longitudinally partitioned by diaphragm into two conduits and having barriers projecting from the diaphragm into one of the conduits at the positions spaced along the length of the conduits and extending to contact intimately with the inside wall of the conduit. This pipe is useful as a hose for transporting liquid or for irrigation. 
Sumitomo Chemical Company, Limited
B B B B B F A B B B
B29L B29C B29L B29L B29C F16L A01G B29C B29C B29C
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Takami Toshio Susumu
Sato Mori Kojimoto