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Diaphragm aperture smoothly widens, macro view inside the optical device.
Electrician installing and connecting ceiling wiring
Kitchen, plumber and man with checklist by sink for pipeline, inspection or maintenance service. Plumbing, work and contractor with clipboard in house for home repair, report or renovation evaluation
Machinist placing drift punch into housing tapping hammer driving sleeve out in machining workshop. Industrial, metalwork, craftsmanship, precision, manual, workshop, engineering

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