DRIVE-IN INVENTIONS

1.The first experiments with in-car heaters, to enable year-round drive-in operation, began where?

2.What was the function of the drive-in "containment" screen?

3.The introduction of concession stands in drive-in theatres:

4.Which of the following drive-in inventions never existed:

5.Some drive-ins had areas with traditional, auditorium-style seating for: