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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.

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.

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.

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.caranddriver.com/news/a15366473/shift-this-a-history-of-porsches-sportoma...

Don’t be fooled by that introduction year for the production PDK transmission—the super-quick-shifting dual-clutch automatic has been in Porsche’s parts bin for more than 30 years.

www.hemmings.com/blog/2018/09/11/last-of-the-first-american-automatic...

All technology has teething problems. Not all technology has teething problems that lead to its near-extinction in the wild, but such is the case with Oldsmobile’s Automatic Safety Transmission, considered the first American automatic transmission, which reportedly exists nowadays in just one vehicle, a convertible that will cross the block at Hershey.

www.hemmings.com/blog/article/ford-o-matic-transmission

Ford’s first automatic transmission, which appeared in its 1951 models, was referred to as the Ford-O-Matic. This basic unit was designed by Borg-Warner and would become the platform from which many later model automatic transmissions would evolve.

www.farmanddairy.com/columns/the-first-real-automatic-transmission/382028.html

A brief history of the automatic transmission. Chrysler is credited with the first push-button automatic transmission with their two-speed Powerflyte introduced in the 1954 models and offered ...

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.quora.com/When-did-automatic-transmission-cars-become-standard-in-the-US

Somewhere between the 1980s and never yet, I’d estimate. For as long as they have been commercially available, automatic transmissions have been added-cost options in many of the vehicles they’re available in. This began to change sometime between...