METAL STEM & Plug in bowls
QUIET COMRADE stamped under cup and on the base of the bowl. The filter holder is designed such that smoke has to travel three time the length of the shank, the last run is enabled to take an absorbtion filter.
The bowl is retained by the filter holder locking into the bowl, this has to be pulled out before the bowl is released. Attempting to unscrew the bowl can have disastrous effects
Variety of bowls , smooth and carved.
Overall length is 5 3/8 inches (137 m/m)
19 Feb 1974 - US patent # 3,792,705 Inventor Robert J Frederick , Ashtabula, Ohio and manufactured by Mech.Tech.Inc., PO box 487 - 3128 State Road - Ashtabula, Ohio 44004 - USA