<P> The earliest patent for a digital alarm clock was registered by D.E Protzmann and others on October 23 , 1956 , in the United States . Protzmann and his associates also patented another digital clock in 1970 , which was said to use a minimal amount of moving parts . Two side - plates held digital numerals between them , while an electric motor and cam gear outside controlled movement . </P>
<P> The earliest patent for a digital alarm clock was registered by D.E Protzmann and others on October 23 , 1956 , in the United States . Protzmann and his associates also patented another digital clock in 1970 , which was said to use a minimal amount of moving parts . Two side - plates held digital numerals between them , while an electric motor and cam gear outside controlled movement . </P>
when was the first digital alarm clock invented
when was the first digital alarm clock invented
D.E Protzmann and others on October 23 , 1956 ,
D.E Protzmann and others on October 23 , 1956 ,