Zero crossers. 

 - 1 online resource (ii, 7, A-1 pages) :  illustrations 
<br/><br/> "August 1991."  "OEI-03-91-00460."  CRDP Project record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medicare.<br/>Diagnostic ultrasonic imaging--Equipment and supplies--Costs.--United States<br/>Cardiovascular system--Testing--Equipment and supplies--Costs.<br/>Cardiovascular equipment industry--Prices--United States.
<br/><br/><label>GPO Item No.: </label>0445-B-07 (online) 
<br/><br/><label>Gov. Doc. Class. No.: </label>HE 1.75:OEI-03-91-00460 
<br/><br/><label>Report. No.: </label>OEI-03-91-00460