// todo need optimize like in event.jsp. Add indexing or not indexing this page. Valdemar Poulsen invents the first magnetic recording (15 gen 1898 anni – 20 sett 1905 anni) (Il nastro del tempo)
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Valdemar Poulsen invents the first magnetic recording (15 gen 1898 anni – 20 sett 1905 anni)

Aggiunto al nastro di tempo:

tv production

Bydanielle
27 set 2017

Data:

15 gen 1898 anni
20 sett 1905 anni
~ 7 years and 8 months
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