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KEN Brand Pipes are made by Prim Associates of America out of Chicago, Ill. The design is unique and somewhat complex and has a patent by Otto Turinsky.[1] This patent was applied for in Dec. 1939 and granted in May 1941, Pat No 2,242,805. An ad in Popular Mechanics from 1946 shows the pipe costing $3.50 and shows Six Key features of the Ken Pipe along with a Money Back Guarantee! Stem is Lucite and the interior chamber contains various technical features to remove tar, moisture, burnt tongue and remove impurities.

1946 Ad from Popular Mechanics
KEN Patent

References