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"Roentgen" induction coils and other X-ray apparatus (1904)
James G. Biddle Company · Philadelphia : James G. Biddle · leaf 45
Figure 28.B3224. (No. 26). Diameter of Bulb, 6 $20.00 40 James G. Biddle, 1114 Chestnut Street, Philadelphia. Volt-OHm Tube, … Figure 29. B3226. (Type V). Diameter of Bulb, 514 $20.00 B3227. (TypeE). sj£ 27.50 B3228. (Type I). sW B3227 and B3228 are provided with regulating devices to lower vacuum. 30.00 Ventril or Valve T\ibe.X-rays · Induction coils · Radiography
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