Chayes Dental Paralellometer and Paralellodrill. Wooden box with name of instrument, manufacturer information, and patent date of 20 April 1915 stamped on lid. Inside lid of box has a detailed printed diagram of pieces contained in box, with each piece individually labeled. 32 pieces present, four pieces missing. Contents include chucks for bucco lingual sizeing mandrels, upright and distal extended sizeing mandrels, anterior sizeing mandrels, tube mandrels and screw drivers, and screw holders and taps; several related mandrels; two dies and a die holder; two taps and two tap drills. Includes a diagram showing proper placement of tools inside of box.