Category:Speaking tubes in art
Jump to navigation
Jump to search
Media in category "Speaking tubes in art"
The following 7 files are in this category, out of 7 total.
-
1910 aircraft intercom - Two tubes for duplex send and receive.jpg 1,024 × 1,527; 277 KB
-
Advertisement for the Gutta Percha speaking tube. Wellcome L0003554.jpg 1,098 × 1,762; 906 KB
-
Tubo acústico o speaking tube, Boquilla y silbato (1882).jpg 1,980 × 838; 349 KB