Method and apparatus for recording signal voltages, particularly of physiological origin
DE964342C
Device for testing electrode seating on the physiological object
DE824666C
Method and device for electrocardiography
US2122183A
Method of and arrangement for stepwise tuning of electric circuits
GB453816A
Device for the step-by-step tuning of apparatus for the high-frequency electrical transmission and reception of intelligence
US1383244A
Combination air-valve and priming-cup
GB137869A
Improvements in or connected with whistles
GB137528A
Arrangement for supplying an adjustable quantity of air to the cylinders of explosion motors, for varying the proportions of the air and fuel in the explosive mixture andeconomising fuel
US1332363A
Air-controlling attachment
DE360056C
Valve for combustion engines to introduce additional air to the explosion mixture
