Vehicle manufacturing companies disestablished in 1929

Ralf-Stetysz was the marque of one of the earliest Polish car manufacturers begun in France and transferred to Poland in the 1920s. It was formed in 1924, when Count Stefan Tyszkiewicz, an inventor and mechanical engineer, started a small automotive firm "Automobiles Ralf Stetysz" in Boulogne-Billancourt near Paris. The name was an acronym in Polish of the name "Rolniczo Automobilowo-Lotnicza Fabryka Stefana Tyszkiewicza" - "Agricultural-Automobile-Aero Factory of Stefan Tyszkiewicz").

Chiribiri was an aircraft and automobile manufacturer in Turin Italy from 1910-1929. Fabbrica Torinese Velivoli Chiribiri & C., (Chiribiri Aircraft of Turin), was founded by the Venetian Antonio Chiribiri, Maurizio Ramassotto and the engineer Gaudenzio Verga.

Sima Violet was a French manufacturer of cyclecars between 1924 and 1929.

Stabilimento Tecnico Triestino (STT) ("Technical Establishment of Trieste") was a private shipbuilding company based in Trieste from the mid-19th to early 20th century, and the most important naval shipbuilding firm of the Austro-Hungarian Empire.

The Locomobile Company of America was a pioneering American automobile manufacturer founded in 1899, and known for its dedication to precision before the assembly-line era. It was one of the earliest car manufacturers in the advent of the automobile age. For the first two years after its founding, the company was located in Watertown, Massachusetts. Production was transferred to Bridgeport, Connecticut, in 1900, where it remained until the company's demise in 1929. The company manufactured affordable, small steam cars until 1903, when production switched entirely to internal combustion-powered luxury automobiles. Locomobile was taken over in 1922 by Durant Motors and eventually went out of business in 1929. All cars produced by the original company were always sold under the brand name Locomobile.

František Kolanda a spol., továrna na automobily was a Czech automobile manufacturer. The production was discontinued after developing their only car model called Enka.

Příbramská strojírna a slévárna was a Czech automobile manufacturer, a successor to the Stelka.

H. C. S. Motor Car Company was a short-lived Indianapolis, Indiana, automobile manufacturer. It may have built as many as 3,000 cars between the summer of 1920 and 1926, when its doors were closed by its creditors.

Roo, formally the Roo Motor Car Manufacturing Company was an Australian company set up to produce automobiles from Australian-sourced components.

The Vernandi was a short-lived French automobile.