These are the Switchboards in our collection.

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This is a photo of 3 SB-22 Korean War Era Switchboards. They are stackable. 2 in the photo have ringers, bell generators and Headphone/Microphone connections. The one on the bottom is all Trunk lines. They physically connect to each other using pring-loaded pins on each side. When carrying these, they have a metal lid and strap. The lid can be used to identify what each line is connected to (OP, Headquarters, Supply, Artillery, etc).

This is the WWII BD-72 Switchboard. It is very heavy and has it's own wood case. It only has 6 lines compared to the SB-22 which has 12. There is a larger version of this known as the BD-71.

THIS IS NOT A GOVERNMENT SITE. IT IS JUST MY WAY SAYING THANK YOU TO ALL THE BRAVE MEN AND WOMEN OF THE U.S. ARMY SIGNAL CORPS, PAST PRESENT AND FUTURE.