Despite the apparent equivalence between the Tocharian A and B vowel systems, in fact a number of vowels are not cognate between the two varieties, and Proto-Tocharian had a different vowel system from either. Source: Internet
Phonologically, Etruscan appears uncomplicated, with a four- vowel system and an apparent contrast between aspirated and unaspirated stops. Source: Internet
Since vowels were not written, reconstructions of the Egyptian vowel system are much more uncertain, relying mainly on the evidence from Coptic and foreign transcriptions of Egyptian personal and place names. Source: Internet
Daniel Jones developed the cardinal vowel system to describe vowels in terms of the features of tongue height (vertical dimension), tongue backness (horizontal dimension) and roundedness (lip articulation). Source: Internet
Due to these extra syllables, it has been hypothesized that Old Japanese's vowel system was larger than that of Modern Japanese – it perhaps contained up to eight vowels. Source: Internet
It has been cited as a language with a vowel system that has 8 vowels which are rather similar to the 8 primary cardinal vowels (Ladefoged 1971:67). Source: Internet