Inventions In which decade were the first successful diode and triode vacuum tubes invented? 1890s 1880s 1900s 1800s 1890s 1880s 1900s 1800s ANSWER DOWNLOAD EXAMIANS APP
Inventions The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project? James B. Conant Robert Oppenheimer Vannevar Bush Leslie R. Groves James B. Conant Robert Oppenheimer Vannevar Bush Leslie R. Groves ANSWER DOWNLOAD EXAMIANS APP
Inventions What furniture item was invented by California furniture designer Charles Prior Hall in 1968? Waterbed Hammock Sofa bed Captain's chair Waterbed Hammock Sofa bed Captain's chair ANSWER DOWNLOAD EXAMIANS APP
Inventions What charge card, developed in 1950, was the first to be accepted nationally in the US? Diner's Club Discover MasterCharge Visa Diner's Club Discover MasterCharge Visa ANSWER DOWNLOAD EXAMIANS APP
Inventions When was the first lawn mower invented? 1849 1830 1854 1835 1849 1830 1854 1835 ANSWER DOWNLOAD EXAMIANS APP
Inventions This part-time race car driver invented the bucket seat in 1969. Who was he?? Harrison Frazier Steve McQueen Paul Newman John Wayne Harrison Frazier Steve McQueen Paul Newman John Wayne ANSWER DOWNLOAD EXAMIANS APP
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