Geological Survey Professional Paper

Geological Survey Professional Paper

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A new, automatic battery charger, designed and developed by the USGS Topographic Division, relieves field engineers of the attendant care required ... The lead-acid battery is relatively inexpensive and able to withstand charging abuse, but because of its weight, it is seriously limited in many field situations. ... On the inside face of the cover are printed a circuit diagram and a set of operating instructions.

Title:Geological Survey Professional Paper
Publisher: - 1966


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