Ocean MC-100 micro cassette recorder Designer (Person) Unknown Manufacturer Ocean Date 1980 - 1989 (circa)
Calculator with built in alarm clock Designer (Person) Unknown Manufacturer Unknown Date 2002 (circa)
Addiator mechanical calculator Designer (Person) Unknown Manufacturer Kingson Date 1960 - 1979 (circa)
Petrous PRMC-1 calculator Designer (Person) Unknown Manufacturer Petrous Electronic Corp Date 1970 - 1999 (circa)