Pinned cylinder and electronic calculator: what they have in common

1. Step 1. Pinned cylinder — works like — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
2. Step 2. Punched card — is used in — Mainframe. Programs were entered on punched cards.
3. Step 3. Mainframe — has part — Integrated circuit. The hybrid circuits of the System/360.
4. Step 4. Integrated circuit — is part of — Electronic calculator. A chip.

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