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en.wikipedia.org/wiki/Automatic_transmission

The first automatic transmission using hydraulic fluid was developed in 1932 by two Brazilian engineers, José Braz Araripe and Fernando Lehly Lemos; the prototype and design were later sold to General Motors, which exhibited a technology in the 1940s Oldsmobile model as a "Hydra-Matic" transmission.

www.answers.com/Q/What_was_the_first_automatic_transmission_car_in_the_US

The first automatic transmission available to the general public was Oldsmobile's Hydra-Matic system. The automatic transmission was based on technology developed by German engineers. Oldsmobile ...

www.mistertransmission.com/a-brief-history-of-the-automatic-transmission

The Hydra-Matic Transmission. The original Hydra-Matic transmission was one of the most important innovations in the history of the automobile. It wasn’t the first automatic transmission, but it was the first one that really worked and its resounding commercial success paved the way for every subsequent autoshifter.

www.youtube.com/watch?v=aa91U4i75l8

FORD Motor Company's Lincoln-Mercury Division introduces the new Automatic Transmission "Merc-O-Matic" for their new 1951 Mercury cars. Skip navigation ... 1 of 2) First Automatic Transmission ...

www.dailykos.com/stories/2018/12/11/1818587/-Automatic-Transmissions-The...

The first automatic transmission in a production car was GM’s Hydramatic, introduced in 1939 in Cadillac and Oldsmobile. The transmission had 4 forward gears and power came from the engine ...

en.wikipedia.org/wiki/Hydramatic

Hydramatic (also known as Hydra-Matic) is an automatic transmission developed by both General Motors' Cadillac and Oldsmobile divisions. Introduced in 1939 for the 1940 model year vehicles, the Hydramatic was the first mass-produced fully automatic transmission developed for passenger automobile use.

itstillruns.com/history-manual-transmissions-5163365.html

Manual transmissions were the standard on most vehicle for the first half of the 20th century, but automatic transmissions were being developed as far back as 1904. General Motors introduced the clutchless automatic transmission under the moniker, Hydra-Matic, in 1938, but the first true fully automatic transmission didn't appear until 1948 ...

www.wikihow.com/Drive-a-Car-With-an-Automatic-Transmission

To drive a car with an automatic transmission, first start the car with your right foot pushed down on the brake pedal. Then, switch the gear lever from "park" to "drive" without letting up on the brake. Check your surroundings to make sure there aren't any people, cars, or animals nearby, then slowly release the brake pedal to start moving ...

ateupwithmotor.com/terms-technology-definitions/hydramatic-history-part-1

GM’s original Hydra-Matic transmission was one of the most important innovations in the history of the automobile. It wasn’t the first automatic transmission, but it was the first one that really worked and its resounding commercial success paved the for every subsequent auto-shifter.

4thefirsttime.blogspot.com/2007/06/1939-first-american-cars-with-automatic.html

The automatic transmission was based on technology first developed in the early 1900s by German manufacturers of marine engines, but it was not adapted for automobiles for several decades. In 1938, General Motors developed the first line of cars with automatic transmissions -- Oldsmobiles that offered "Hydra-Matic drive."