OASDI stands for old age, survivor and disability insurance, which is more commonly referred to as Social Security. To pay for these programs, the federal government imposes a tax on earned income that must be withheld by your employer.
According to the December 1985 issue of Popular Mechanics, the Protex Safety Signal Company introduced flashing turn signals in 1920. The first modern turn signal, though, can be attributed to Edgar A. Walz, Jr. who, in 1925, secured a patent for one and tried to market it to major car manufacturers. They just weren't interested, and the patent expired fourteen years later. Meanwhile drivers and inventors kept working on other solutions.
Here again, the Hazard switch selects the power source for the flasher from one of 2 fuses. The lower switch section connects both Left and Right bulbs to Term #49a on the flasher so that all 4 bulbs flash. 6-Wire Indicator Switch. Now lets turn to the Turn Signal system used on early cars. From the mid 50's thru 1961, cars which did not have semaphores used the Stop lights to double as the rear Turn indicators. To do that, a special Turn Signal switch with 6 wires instead of the later 3-wire design was used. This switch had to route the flasher output to the Brake light being used for Turn indication while leaving the remaining Brake light to function from the Stop light switch.