conical spring for sale, brand-new and used.

Steff Power Feeder; Model #: 2038CI (4) rollers, variable speed from 9 to 59 FPM; 1 HP motor; 4-3/4" roller diameter; 2-1/4" roller

Steff Power Feeder; Model #: 2038CI

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Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories . The Artificial Mastoid Type 4930 has been designed for the calibration of bone conduction hearing aids and bone vibrators used in audiometry. It consists of a mechanical simulation of the human head, incorporating a built-in force transducer to monitor the output of the device to be calibrated.