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Wolf-Fleissner “Singing” Safety Lamp Model 712

Having a corrugated bonnet, Wolf’s Fleissner lamp number 712 was designed more in line with Friemann & Wolf’s standard safety lamp for underground use.  Introduced about 1925, the lamp was advertised along with model number 713, although whether the 712 & 713 was manufactured concurrently with the 1923 model is questionable.

Sectional view drawing patent No. 410038 February 18, 1925.

Click on the images below to see more Wolf-Fleissner “Singing” Safety Lamps: