Balanced microscope stand and sonar: what they have in common

1. Step 1. Balanced microscope stand — is part of — Operating microscope. It holds the optics above the field.
2. Step 2. Operating microscope — is used in — Lens replacement. Under a microscope.
3. Step 3. Lens replacement — uses — Ultrasound. Phacoemulsification.
4. Step 4. Ultrasound — is used in — Sonar. Ultrasonic pulses.

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