Physiological Bases of the Visible Speech Symbols for Consonants positions are distinguished by having the breath phalanx of the thumb close to the plane of the palm, vintage line drawing or engraving illustration.

Physiological Bases of the Visible Speech Symbols for Consonants positions are distinguished by having the breath phalanx of the thumb close to the plane of the palm, vintage line drawing or engraving illustration. - 132966259

Vector illustration of a man's nose and mouth. Hand drawn.

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