sentinel. A person or special body of persons assigned to provide protection or keep watch over, for example: guard, lookout, picket, protector, sentry, ward, watch.
Victrola. Originally, a phonograph from the Victor Talking Machine Company, Camden, NJ, but it eventually became more of a generic term for any brand of phonograph.
this idea was quickly patented and the copyrighted name victrola was given to this new invention the term victrola thus applies only to internal horn phonographs made by the victor talking machine company and is not a generic term for all old phonographs the first internal horn phonograph initially designated as the victor victrola was marketed in 1906