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John Bulwer (below) was an English physician who published his first
two books The Natural Language of the Hand and The Art of Manual Rhetoric in 1644. He was convinced that
"language of the hand" was "the one language that was natural in all men, especially for the deaf in the use of a manual alphabet".
In 1648, he published The Deaf and Dumb Man's Friend, which is the first English book explaining "the subject
of deafness and its accompanying language problems, but had no bearing on the actual teaching of deaf persons."
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