Bakelite and elevator: what they have in common

1. Step 1. Bakelite — is material for — Rotary dial. The dial is Bakelite.
2. Step 2. Rotary dial — has part — Spring. A return spring.
3. Step 3. Spring — is part of — Elevator safety brake. Springs throw out the catches when the rope goes slack.
4. Step 4. Elevator safety brake — is part of — Elevator. Otis’s safety brakes.

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