LANGNER, P H <br/><br/>
RECORDING HIGH-FREQUENCY COMPONENTS WITH A CONVENTIONAL DIRECT-WRITING ELECTROCARDIOGRAPH AND A FOUR-SPEED FM MAGNETIC TAPE RECORDER.  [electronic resource] 

 -  American heart journal  May 1964 
 - 712 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0002-8703 
<br/><br/><label>Standard No.: </label>10.1016/0002-8703(64)90345-x  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrocardiography<br/>Equipment and Supplies<br/>Humans<br/>Magnetic Phenomena<br/>Movement<br/>Tape Recording<br/>Writing