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Both, the housing and the potentiometer control as well as the rotary switch for selecting the source are made of anodised aluminium, while the front panel of the housing and the controls are milled from solid material.
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The rotary potentiometer is mechanically connected to the volume control by a 150mm long shaft.
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The effort is the result of decades of work by Rotary International, along with The Centers for Disease Control and Prevention, the WHO and UNICEF.
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The Global Polio Eradication Initiative also includes the World Health Organization, Rotary International, the U.S. Centers for Disease Control and Prevention and UNICEF.
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