when did cars start having passenger side mirrors
Wing mirror In the 1940s many roads were unpaved and had two lanes, one in each direction. Drivers had to be aware only of traffic on their side and directly behind them (rear view). Due to this, most passenger vehicles with an internal rear-view mirror until the late 1960s had the passenger-side mirror only as an optional addition, as it was considered a luxury.
Sonic Drive-In Originally, Top Hat customers would park their automobiles anywhere on the gravel parking lot and walk up to place their orders. However, on a trip to Louisiana, Smith saw a drive-in that used speakers for ordering. He suspected that he could increase his sales by controlling the parking and having the customers order from speakers at their cars, with carhops delivering the food to the cars. Smith borrowed several automobiles from a friend who owned a used-car lot to establish a layout for controlled parking. He also had some so-called "jukebox boys" come in and wire an intercom system in the parking lot. Sales immediately tripled. Charles Woodrow Pappe, an entrepreneur, chanced upon the Shawnee drive-in and was impressed. He and Smith negotiated the first franchise location in Woodward, Oklahoma, in 1956, based on nothing more than a handshake. By 1958, two more drive-ins were built, in Enid and Stillwater.[7]