Today in 1882, U.S. Patent No. 252, 576 for a “a new system for multiple [telephone] switchboards” was granted to Leroy B. Firman.
For more on telephone switchboards, see here and here and here.
Patent for Multiple Telephone Switchboards Granted
Today in 1882, U.S. Patent No. 252, 576 for a “a new system for multiple [telephone] switchboards” was granted to Leroy B. Firman.
For more on telephone switchboards, see here and here and here.
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