Thermal print head and autoclave: what they have in common

1. Step 1. Thermal print head — is part of — Fax. It prints the received image.
2. Step 2. Fax — uses — Telephone. Transmission over a telephone line.
3. Step 3. Telephone — has part — Rotary dial. A dial.
4. Step 4. Rotary dial — has part — Spring. A return spring.
5. Step 5. Spring — is part of — Safety valve. A spring-loaded valve.
6. Step 6. Safety valve — is part of — Autoclave. A safety valve releases pressure.

Open Evothings