Aluminium panel frame and personal computer: what they have in common

1. Step 1. Aluminium panel frame — is part of — Solar panel. An aluminium profile.
2. Step 2. Solar panel — is part of — Electronic calculator. Many run on a solar cell.
3. Step 3. Electronic calculator — evolved into — Microprocessor. The Intel 4004 was designed for a Busicom calculator.
4. Step 4. Microprocessor — is part of — Personal computer. The PC became possible thanks to the microprocessor.

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