Estimated Date: 1920
Manufacturer: ESI (Electro Surgical Instrument Co.)
Description: 6.5” x 0.5” nickle plated tube 0.5“x1” head has a compartment in the head for an extra bulb. This unscrews to reveal a 5.5” telescope with side arm for connection. All in a cardboard box with original label and Washington 3 cent stamp. Box also contains the electrical cord Pat. June 8, 1926 and an obturator.
Reference 1: 33