Across
- 2. A device built to observe distant objects
- 5. device using electrical signals to send message
- 7. the use of the telephone to sell directly
- 9. A person who sells a line of products
- 10. television broadcaster
Down
- 1. mind to mind communication
- 2. a message sent by telegraph
- 3. far, distant
- 4. a device for transmitting and receiving sounds
- 6. use of equipment to provide voice communication
- 8. a device to receive pictures and sounds