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from article Current comparator
Room-temperature alternating-current (ac) comparator.
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from article Current comparator
Cryogenic current comparator.
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from article Agricultural machinery
A tractor pulling a multipurpose machine used for precision tillage and planting. (Credit: Scott Bauer/U.S. Department of Agriculture)
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from article Agricultural machinery
Agricultural aircraft applying a chemical pesticide on a field. (Credit: jupiterimages/Getty Images)
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from article Agricultural machinery
A combine harvester hopper filling up with corn kernels as the machine harvests the field. (Credit: Glow Images)
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from article Agricultural machinery
A harvester machine is used to drop tomatoes into a container. (Credit: Phil Schermeister/National Geographic RF/Getty Images)
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from article Lemming
The lemming, a small burrowing rodent with short legs and stout claws adapted for digging. (Photo by Robert R. Nack, Minnesota Cooperative Fish and Wildlife Research Unit)
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from article Geometrical optics
Geometrical wavefront for a family of rays associated with a point source.
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from article Geometrical optics
Refraction of a ray at a smooth surface between two homogeneous media.
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from article Geometrical optics
Focal system.
