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Wolf- Fleissner “Singing” Safety Lamp- 1923 Patent
This model is identical to the German 1923 patent and differs in various ways compared with model number 712 & 713. While 
this example is un
marked, there have been specimens found with Wolf Safety Lamp of America, and Wolf Leeds. There are at least two (2) examples of this model made of aluminum, and marked with Wolf Safety Lamp of America. Judging from an American advertisement (see right), it appears that this was the first commercial model to be exported. The advertisement indicates other models to be introduced, but American advertisements with the additional models have not been found.
From Wolf Safety Lamp Of America Advertisement.
Sectional view of singing Wolf Fleissner lamp. Patent No.
387506 drawing; December 29, 1923.
Click on the images below to see other Wolf-Fleissner Singing Safety Lamps:
