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1 out 1987 ano - 1987年10月1日上海供用电研究所高压等电位自验式声光验电器获得上海电业系统第一个国家专利权。

Descrição:

1987年10月1日上海供用电研究所高压等电位自验式声光验电器获得上海电业系统第一个国家专利权。

Adicionado na linha do tempo:

工业大事年表

2 set 2023

1

0

686

Data:

1 out 1987 ano

Agora

~ 38 years ago

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