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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 jan 1950 ano - Various forms of silicones were invented. They are chemically combined substances with carbon groups holding them together. They were used for sealants and lubricants.

Adicionado na linha do tempo:

30 out 2017
0
0
443

Data:

1 jan 1950 ano
Agora
~ 75 years ago