[Dental Calipers] Metal [dental calipers]. Two arms of equal length, each with a hooked tip, moveable and joined at central point. There is a scale of 1-10 engraved on one arm. On the other side of the same arm is the maker's name "ALLEN & HAN[BURYS]", which is partially covered by a black label with the name "MARTIN". The name "DR. E.A. MARTIN" is etched on one side of the other arm. [1925-1975]