Vacuum cleaner
The vacuum cleaner evolved from the carpet sweeper via manual vacuum cleaners. The first manual models, using bellows, were developed in the 1860s, and the first motorized designs appeared at the turn of the 20th century, with the first decade being the boom decade.
History of the automobile
The vintage era lasted from the end of World War I (1918), through to the Wall Street Crash at the end of 1929. During this period the front-engined car came to dominate with closed bodies and standardised controls becoming the norm. In 1919, 90% of cars sold were open; by 1929, 90% were closed. Development of the internal combustion engine continued at a rapid pace, with multi-valve and overhead camshaft engines produced at the high end, and V8, V12, and even V16 engines conceived for the ultra-rich. Also in 1919, hydraulic brakes were invented by Malcolm Loughead (co-founder of Lockheed); they were adopted by Duesenberg for their 1921 Model A. Three years later, Hermann Rieseler of Vulcan Motor invented the first automatic transmission, which had two-speed planetary gearbox, torque converter, and lockup clutch; it never entered production. (Its like would only become an available option in 1940.) Just at the end of the vintage era, tempered glass (now standard equipment in side windows) was invented in France. In this era the revolutionary ponton design of cars without fully articulated fenders, running boards and other non-compact ledge elements was introduced in small series but mass production of such cars was started much later (after WWII).