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    Choose power conversion equipment from Danfoss and optimize your energy usage. Advanced power conversion technology by Danfoss.

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  2. History of radiation protection - Wikipedia

    en.wikipedia.org/wiki/History_of_radiation...

    Unprotected experiments in the U.S. in 1896 with an early X-ray tube (Crookes tube), when the dangers of radiation were largely unknown.[1]The history of radiation protection begins at the turn of the 19th and 20th centuries with the realization that ionizing radiation from natural and artificial sources can have harmful effects on living organisms.