| Telephone | An instrument that converts voice and other sound signals into a form that can be transmitted to remote locations and that receives and reconverts waves into sound signals. |
| Optical Fiber | A flexible optically transparent fiber, usually made of glass or plastic, through which light can be transmitted by successive internal reflections. |
| Leather Case | A case made of leather material, dressed or tanned hide. |
| Walkie Talkie | A hand-held portable, two-way radio transceiver. |
| TV Antenna | An antenna suitable for transmitting or receiving television broadcasts; since television transmissions in the United States are horizontally polarized, the most basic type of receiving antenna is a horizontally mounted half-wave dipole. |
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