Interior of a Socony Service Station, 1929

By the late 1920s, gas stations were fixtures in the American landscape. As the market became more crowded, gas itself was priced competitively, while stations made money on the "TBA" trinity of tires, batteries, and accessories. This interior shot of a Socony (Standard Oil Company of New York) station service bay is typical, featuring oil, tires, belts, and a radio.