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engraving fro m p a te n t. "G reat Britain, P atent O ffice, no. 4240,8 Apr. 1818. A nnesley to o k o u t a virtually id entical p a te n t th re e years later. (No, 4549, 5 Apr. 1821) C opies o f th e p rin te d d o cu m en ts are in th e U niversity o f Toronto, Robarts Library. 28