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"Obach" dry cell

"Obach" dry cell

1911
Every ready battery, 1917

Every ready battery, 1917

1917
"Obach" dry cell, sectioned

"Obach" dry cell, sectioned

1911
Two Siemens dry cells, size S, one powering portable potentiometer the other powering potential source

Two Siemens dry cells

1940-1969
Two "Obach" dry cells, one sectioned, 1911 (see 2 stroke nos).

Two "Obach" dry cells

1911