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• The helium-neon and argon-ion lasers provided a continuous output of laser light, as opposed to the pulsed output of the metal vapours.

• The metal-oxide-semiconductors technology produces transistors of the unipolar type in contradistinction (or in contrast) to the earlier junction transistors, which are bipolar.

• Contrary to upsetting, extrusion reduces the diameter of ...

• Contrary to popular belief, not all mixtures of hydrogen and oxygen are dangerous.

• In contrast to most metals, the conductivity of semiconductors increases with temperature.

• Our compasses today depend upon the same forces.

• The teloblast lies deep and is out of focus.

• An out-of-focus photograph ...