What are the quietest, coolest and most powerful Dog Grooming Clippers?

What are the quietest, coolest and most powerful Dog Grooming Clippers?

I bought all my equipment for grooming when i was in school and now im looking for a more long term better quality clipper. Any people with experience in the grooming profession are encouraged to answer my question.

Also anyone with clippers that perform badly i would like to know about too, so i do not experiment with them.

Thank You Much.

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