When were 78 rpm records invented?

Answer According to the Yale Library, 78 rpm records were invented in 1898 and were made until about 1950. Depending on the disc size, most 78 rpm records have a duration of three to five minutes per side... Read More »

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When were lp records invented?

Long Playing Records or "LPs" were invented in 1948. They waned in popularity, in the early 1990s due to the introduction of the CD. LPs are made of vinyl and hold up to 60 minutes of music. They a... Read More »

When were 45 RPM records invented?

RCA Victor released the first 45 RPM record to the general public on March 31, 1949. The 7-inch disc contained "Texarkana Baby" and "Bouquet of Roses" by RCA singer Eddy Arnold. The 45 RPM contin... Read More »

When Were Electronic Medical Records Created?

Electronic medical records (EMRs) were developed throughout the mid-to-late 1960s and launched in 1967; this was the year that the University of Vermont's PROMIS project and Latter Day Saints Hospi... Read More »

When were cell phones invented&who were they made by?

Martin Cooper invented the cell phone in 1973, and Motorola was its maker. The phone was much bigger and heavier than today's models. Called the DynaTAC, the phone did not go one sale until 10 year... Read More »