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Xconomy
From The Telephone Gambit: Did Bell Steal His Legendary Invention? (Part Two):
Elisha Gray’s diagram—
The diagram from page 3 of Elisha Gray’s caveat, a confidential document filed at the U.S. Patent Office on February 14, 1876, nearly three weeks before a nearly identical drawing appeared in Bell’s notebook. (Click image to enlarge further.)
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