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The Synchro Stem patent

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The Synchro-Stem patent for Kaywoodie's Drinkless pipes was applied for in 1929 and granted in 1932.
The system consists of a screw-in attachment combined with the earlier Drinkless patent.
Large Drinkless system
The stinger's lenght is variable in order to fit the length of the shank.
This flexibility was facilitated by the manufacture of the aluminium attachment at Kaywoodie's plant.
Shorter Drinkless system
The Drinkless patent references were etched on the stinger.
DRINKLESS & PAT# etched on the stingerMarkings on the stinger
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