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Hughes Family
Koehler Aluminum Early Model
Koehler Aluminum Early Model Top Marking
Koehler Aluminum Early Model Marking
Koehler Aluminum Early Model Assembly
  Koehler Aluminum Models -Early on Left and Late on Right.JPG - KOEHLER LAMPS - During the late 1940s, Koehler redesigned their safety lamp making it 2 in. shorter and available in steel, aluminum or brass.  The aluminum Koehler 'National"  lamp shown on the right  with a double gauze and magnetic lock was approved by the USBM as No. 209 on April 30, 1948.  The early aluminum version shown on the left was offered in the 1916 Koehler catalog but was approved as permissible by the U.S. Bureau of Mines in 1919 for only the magnetic lock version.  It's interesting that the lamp on the left with a key lock has a property marking of the U.S.B.M. apparently obtained for use prior to 1919.  
Koehler Aluminum
Koehler Aluminum Permissible Top Marking
Koehler Steel Approval 201
Koehler Steel Approval 201 Top Marking
Koehler

Koehler Aluminum Models -Early on Left and Late on Right | KOEHLER LAMPS - During the late 1940s, Koehler redesigned their safety lamp making it 2 in. shorter and available in steel, aluminum or brass. The aluminum Koehler 'National" lamp shown on the right with a double gauze and magnetic lock was approved by the USBM as No. 209 on April 30, 1948. The early aluminum version shown on the left was offered in the 1916 Koehler catalog but was approved as permissible by the U.S. Bureau of Mines in 1919 for only the magnetic lock version. It's interesting that the lamp on the left with a key lock has a property marking of the U.S.B.M. apparently obtained for use prior to 1919. Download Original Image
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