Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 305
is the preferable type of Davy Safety Lamp for testing forthe presence of gas. It is extremely sensitive in presenting the samegaseous condition within as exists outside the lamp. Has aluminum tank,brass wind shield (movable), and lock. This particular model is recom-mended for use among mine…
Engineering instruments · Drawing instruments
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