In 1946 the number of theaters goes from 102 to 155. By 1948 there are 820 drive-in theaters across the U.S. With the concept of the Drive-In Theater being strange to most people, new drive-ins would host an "Open House" durring the day to let people know what to expect. They would show the future customers how to park, how the sound systems worked, and what food was available in the concession stands. Some Drive-Ins reported as many as 400 cars would show up for the open house.
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The Baby Boom
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