These are the other two Companies I have found. The top row is: Waterbury Battery Co. Waterbury Battery Oil Plainville Conn. Keystone mark #'s on bottom-Clear, 2nd bottle is No Name just embossed 2 1/2 FL.OZS.,Owens Illinois mar on bottom-Clear. These were found on the Waterbury plant dump along with the Waterbury marked ones I purchased from a bottle collector. 3rd bottle Same as 1st except smaller and around the top 2FL.OZ. #'s on bottom-Clear. Bottom row: National Carbon Co. Div of Union Carbide & Carbon Corp NY. Large embossing, Arrowhead mark on bottom-Clear, Next bottle No Name marked BATTERY OIL, Arrowhead mark on bottom-Clear. These were National Carbon Co. bottles. My guess is that the Waterbury and National No Name bottles were made for other battery companies to service them with battery oil.