Geiger Muller Counter, Philips 18504 original packaging, unused - GiMiTEC
Geiger Tube 18504 - Physics Museum - The University of Queensland, Australia
One 18504 ZP1400 MX147 PHILIPS TUBE, EINDHOVEN ,NEDERLANDS | #290963485
Philips Electron Tube Division - Radiation Counter Tubes - 1965
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