Patent 281,175 issued July 10, 1883, including illustrations and typed description of a current manipulator for secondary battery charging Charles F. B Show morePatent 281,175 issued July 10, 1883, including illustrations and typed description of a current manipulator for secondary battery charging Charles F. Brush, Sr., Papers Series 3: Patents (1872-1888) Box 9 Folder 3 Show less
Patent 281,176 issued July 10, 1883, including illustrations and description of apparatus for measuring the amount of current energy received by a sec Show morePatent 281,176 issued July 10, 1883, including illustrations and description of apparatus for measuring the amount of current energy received by a secondary battery Charles F. Brush, Sr., Papers Series 3: Patents (1872-1888) Box 9 Folder 3 Show less