Before revision: It is also known by the common brand names Zip-A-Tone (1937, now defunctManufacturer-supplied first use date for ), Chart-Pak ( 1949Manufacturer-supplied first use date for ), and Letratone (1966, from LetrasetManufacturer-supplied first use date for ).
After revision: It is also known by the common brand names Zip-A-Tone (1937, now defunct Zip-A-Tone: Registration Certificate – Manufacturer-supplied first use date for ), Chart-Pak ( 1949 Chart-Pak: Registration Certificate – Manufacturer-supplied first use date for ), and Letratone (1966, from Letraset Letratone: Registration Certificate – Manufacturer-supplied first use date ).