The tanks that Dick shows were used in general stores, and maybe anywhere, where they dispensed small amounts of liquids. These small tanks were used to pump linseed oil, syrups, molasas, paint thinner, etc. Remember Bowser went into the pump business, they were not selling gas pumps. They were selling small pumps that were used in general stores, then they branched out to sell small pumps to machine shops, etc. Then when they finally invented the automobile, pumps that would pump larger amounts of gasoline.
Gilbarco was a large company making lanterns, but their idea was to have them fualed by gasoline instead of kerosene. They sold so many gasoline lights that Standard Oil invested in them, that is why so many early Gilbarco sales brochure have Standard's name in them. Compared to kerosene very little gasoline was sold before the invention of the automobile. Bowser was the company you went to, to purchase a pump for your kerosene.
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available