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Votchala plethysmograph

Votchala plethysmograph (B. E. Votchal, Soviet therapist, 1895-1971; Greek plzthysmos – increase, filling + Greek graphu – to represent, write) – the three-channel plethysmograph equipped with the photochart recorder and the pneumatic sensor controlling changes of the volume (krovenapolneniye) of a finger.

 
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