What were rotary phones made of?

Related questions

1. Why do phones have a dial tone?
2. Why is my home phone not working?
3. What is pulse tone?
4. How does a dial tone work?
5. How long does a phone ring?
6. What is the frequency of dial tone?
7. What does it mean when you call a number and get a dial tone?
8. What are DTMF tones on a cell phone?
9. Do rotary phones still work UK?
10. What is mt8870 DTMF decoder?

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5. #service
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23. #strowger