Vintage Grass Instruments Lab Equipment: Polygraph 1DAG DC Amplifier & 7P1G Pre-

VINTAGE Grass Instruments LM4 Lesion Maker / electronics Sci Fi Prop Mid Century

Grass P15 A.C. Preamplifier Model P15B

Grass Instruments SIU5B Stimulus Isolation Unit and CCU1A Constant Current Unit

Grass Medical SD 5 Stimulator

R195952 Grass Medical Industries AM8 Audio Monitor AM8B

GRASS INSTRUMENTS P15 A.C PREAMPLIFIER