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10M telephones (1 janv. 1918 – 31 déc. 1918)

Description:

It was estimated that approximately ten million Bell system telephones were in service throughout the U.S.

Ajouté au bande de temps:

click for descriptions/PHONE TIMLINE

23 oct. 2018

0

0

420

Date:

1 janv. 1918

31 déc. 1918

~ 12 months

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