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Armies still relied on signal lamps and carrier pigeons to deliver messages that could mean the difference between life and death.

A sort of industrial carrier pigeon, popular long before email and Amazon, pneumatic tubes used to be common in office buildings, hospitals, department stores and such.

If he continues to bat like this, he is well within his rights to deliver his pre-match message via carrier pigeon.

Adler spearheaded a number of moves to modernize Reuters, which gained fame in its early days for using carrier pigeons to relay scoops.

According to Robert Gildea, a professor of modern history at the University of Oxford, England, carrier pigeons were important in World War I “as a rapid and fairly secure means of communication.”