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en.wikipedia.org/wiki/Automatic_transmission

An automatic transmission, also called auto, self-shifting transmission, n-speed automatic (where n is its number of forward gear ratios), or AT, is a type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually.

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.

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.

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 ...

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.

www.answers.com/Q/What_was_the_first_automatic_transmission_car_in_the_US

The first fully automatic car available in the US was the 1940 Oldsmobile. From aprox 1950 many cars were available with your choice of an automatic transmission or standard transmission.

itstillruns.com/powerglide-transmission-history-8690389.html

General Motors was the first of the Detroit automakers to offer an affordable automatic transmission for its cars. Ford introduced its automatic in 1951 and Chrysler in 1954. When a fire damaged GM's Hydramatic automatic transmission factory in 1953, GM fitted its Pontiacs and Oldsmobile with the Powerglide.

www.hemmings.com/blog/2014/05/16/oldsmobiles-hydra-matic-first-mass-produced...

Automatic transmissions have become more than just ubiquitous in recent decades – they’ve become all but the only transmission available in newer cars. But it took decades of development and a number of missteps and half-steps before the first mass-produced fully automatic transmission appeared – Oldsmobile’s Hydra-Matic, which entered ...