Stevens, Davis, Miller & Mosher
Equipment for producing special pipes
 Equipment for producing a pipe having a longitudinally extending diaphragm which partitions the interior of the pipe into two conduits. This equipment comprsises a die head with a circular slit to extrude the tubular body of the pipe and a flat slit to extrude the partitioning diaphragm. Means are provided to deform that diaphragm at spaced apart intervals along its length so as to intimately contact one of the pipe walls at those intervals. This means may be a nozzle having an opening for expelling a fluid against the diaphragm while it is still in a plastic state or a movable plate similarly positioned. 
Sumitomo Chemical Company, Limited
B A B B B B F
B29L A01G B29C B29C B29L B29C F16L
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Takami Toshio Susumu
Sato Mori Kojimoto