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Sight glass tube cutter, unmarked.
Price: $20.00 plus shipping.
Misc-12
This handy little tool was used for making the short lengths 
of tubular glass in which the water level (in a boiler) 
or drops of oil (in a sight-feed lubricator) could be seen.
The little roller scores the inside of the tube so that it will break cleanly when simultaneously pulled and bent.

Condition is as new.