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The Geiger-Muller tube or GM tube was originally created by Hans Geiger and then further improved with the assistance of Walther Muller ( Müller )
with a tiny dent on the edge
extending its service life
maker marked “Christian Lauer
TRANSMITTER BC - 611 - E
Original Swiss WWII Swedish Issue M/41 80cm 12x Coincidence Rangefinder by Wild of Heerbrugg with Carry Case & Ranging Bar Snider Rifle Accessories The Geiger-Muller tube or GMOriginal Item: Only One Available. A coincidence rangefinder or coincidence telemeter is a type of rangefinder that uses mechanical and optical principles to allow an operator to determine the distance to a visible object. There are subtypes split image telemeter, inverted image, or double image telemeter with different principles how two images in a single ocular are compared. Coincidence rangefinders were important elements of fire control systems
