What were the two electronic devices that farnsworth combined to invent the electronic television?

In 1930, the same year that Farnsworth was granted a patent for his all-electronic TV, his labs were visited by Vladimir Zworykin of RCA, who had invented a television that used a cathode ray tube (1928) and an all-electric camera tube (1929).

what are two things that greatly the american economy after the war? the huge buildup of u.s. military the beginning of the korean conflict the creation of the gi bill the marshall plan for nations

the outcome of 1970 oil crisis in united states was that, they began to search ways on how to reduce oil.

in 1970 was a period when there were energy and oil crisis. those who were major centers for industrialization were forced to keep way from supplying of petroleum.

some of the result of this crisis was economic growth became stagnant because prices of oil surged.

due to the increased prices some countries like mexico and norway benefited.