Grass Instruments Model 7LSA EKG Lead Selector

Grass Medical Instruments SM6 Stimulator Working Condition

Vintage Grass Instruments Model 8A5 (Untested)

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GRASS INSTRUMENTS ELECTRODE SELECTOR PANEL RACKMOUNT RARE USED

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Grass Instruments Model 7P511J Amplifier For Data Processing

GRASS Instruments Polygraph Low Level DC Pre-Amplifier 7P1G UNTESTED