Stereoview of Serbian Soldiers in a Trench Probably on the Macedonian Front Titled "Serbian Trench - Awaiting Phone Call From Listening Post to Fire Rocket For Illuminating 'No Man's Land.'" (1910's)

Stereoview of Serbian soldiers in a trench probably on the Macedonian Front titled "Serbian trench - awaiting phone call from listening post to fire rocket for illuminating 'No man's land.'" Published by the Keystone View Company.

Source.

A Young Woman Demonstrating an Electrophone With Which She Could Listen to Live Entertainment Such as Plays and Concerts Over the Telephone Line (1901)

A young woman demonstrating an electrophone with which she could listen to live entertainment such as plays and concerts over the telephone line, 1901. By Foulsham and Banfield. From the March 30, 1901 issue of Black and White Budget.

Animated Christmas Stereoview Titled "Santa Claus Telephoning For Supplies" (1897)

Animated Christmas stereoview titled "Santa Claus telephoning for supplies," 1897. By Benjamin West Kilburn.

Source.

Animated Stereoview of a French Artillery Observation Post on the Marne Front During World War I

Animated stereoview of a French artillery observation position on the Marne front during World War I. Published by Keystone View Company.

Source: New York State Military Museum and Veterans Research Center.