One more pointer to oil tank related -- from various "google advanced book search" forays it appears RIVERSIDE BOILER WORKS, Cambridge, Mass. was a steel tank manufacturer that got into the business of making oil tanks (both underground and "basement" ) for home heating systems -- several "snippet view only" hits in late 1920s, early 1930s. And a general "we are the largest steel tank manufacturer in New England" ad in a 1919 trade directory.