Servomotor and boyle’s air pump: what they have in common

1. Step 1. Servomotor — is part of — Insulin pump. A stepper motor moves the plunger.
2. Step 2. Insulin pump — has part — Piston. The reservoir’s plunger.
3. Step 3. Piston — is part of — Boyle’s air pump. A plunger.

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