Category:1921 inventions
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Subcategories
This category has the following 2 subcategories, out of 2 total.
R
- RCA Radiola Loudspeakers (9 F)
S
- Spherophone (1 F)
Media in category "1921 inventions"
This category contains only the following file.
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Edward Kellogg & Chester Rice with cone speaker 1925.jpg 935 × 603; 360 KB