Adolph Rickenbacker
I think Les Paul invented the first electric guitar
The first electrically amplified guitar was not invented until 1931 by George Beauchamp, but it was Adolph Rickenbacker who manufactured them in 1932. However, as well as many others, Les Paul did experiment extensively by adding microphones to the bridge of an acoustic guitar in the 20's.
The guitar wasn't actually officially declared invented until 1929, but Les Paul had been attempting to perfect amplification since the early 1920's. It was George Beauchamp who first invented the electrically amplified guitar and Adolph Richenbacher (Rickenbacker) first manufactured them in 1932. Les Paul then had the chance to make some of the better electric guitars in 1936.
The Walker Brothers invented the first electric dishwasher in 1913.
1929
The first car radio was invented in 1929.
DECCAN QUEEN - The first electric train in India was named as DECCAN QUEEN which started in 1929 and travelled from Kalyan to Punethe first electric train in India was named as DECCAN QUEEN which started in 1929 and travelled from kalyan to pune....
AG Spalding invented the first basketball used in an official game in 1929.
Karl Benz invented the first car on April, 4 1929
(1843-1929)Elija McCoy, He invented the first oil cup for trains.
The first radiosonde was used in 1929. The Frenchman, Robert Bureau invented it.
The first patent for automobile turn signals was granted in 1925 (some sources say 1929--it may depend on your interpretation of the claims on the different patents). Electric turn signals first appeared on production cars in 1938.