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My wife found me a really cool little glass bottle at a garage sale. It is embossed raised letters 
on glass, about the form-factor of a tiny milk bottle, probably holds 4 oz. It's got Edison's 
trademark signature on one side and the other side says:

Edison Battery Oil
Made in U.S.A.
--------------------
Thomas A. Edison
Incorporated
Bloomfield, N.J.
U.S.A.

So, can someone tell me more about it? What batteries would need oil? What era would this be from? 
Thanks!

-- Tom Fine