Category:Early telecommunications

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Pages in category "Early telecommunications"

There are 14 pages in this section of this category.

B

Beacon

C

Carrier pigeon

D

Drum (communication)

F

Fiery cross

H

I

International maritime signal flags

O

Optical telegraph

P

Photophone

P cont.

Polybius square

R

Relay league

S

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Category: Telecommunications history

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