33
/pt/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 1, 2025
2366743
197610
2
Public Timelines
FAQ Receber premium

1 jan 1945 ano - OVERHEAD PROJECTROR

Descrição:

Roger Appledorn was responsible for the technology that was used for the first overhead projector. n 1945, the U.S. Army used overhead projectors for training just as World War II was ending. Then in the late 1950s and early 1960s, overhead projectors began to be used in schools and businesses.

Adicionado na linha do tempo:

17 dez 2018
0
0
740

Data:

1 jan 1945 ano
Agora
~ 80 years ago

Imagens: