Category:Telephones in the 1870s
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This category has only the following subcategory.
Media in category "Telephones in the 1870s"
The following 2 files are in this category, out of 2 total.
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Box telephone of 1877.jpg 650 × 415; 41 KB
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Carbon-resistance telephone transmitter, 1878.jpg 3,246 × 1,799; 1.44 MB