Analysis of information sources in references of the Wikipedia article "Votrax" in English language version.
{{cite web}}
: CS1 maint: archived copy as title (link)19xx VSK - on encapsulated circuit cards for personal computers (Radio Shack, Tandy Corp.) and products like Handivoice, (HC Electronics, Mill Valley CA)
The first commercial mass-marketed communication aid with speech synthesis was probably the Handivoice from the Federal Screw Works and Phonic Ear (1978)
{{cite web}}
: CS1 maint: archived copy as title (link){{cite web}}
: CS1 maint: unfit URL (link){{cite web}}
: CS1 maint: unfit URL (link){{cite web}}
: CS1 maint: unfit URL (link)