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NEW SERIES. | s SINGLE CoPigs, 15 cts, 
You, XIII. No. 332. FRIDAY, May 10, 1901. ANNUAL SUBSCRIPTION, $5.00, 
‘Queen X-Ray Apparatus 
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Queen Self-Regulating X-Ray Tube "hae 
QUEEN & CO., Inc. 
J. G. GRAY, President 
59 Fifth Avenue, N Y 
480 Monon Bldg., Chicago PHILADELPHIA 
