Holtzapffel & Company Lacquered Brass Odontagraph, London, c. 1880, inscribed in script on the face Scale of Centres inside the Pitch Circle/W.H. Fisher 63/ Professor Willis's Odontagraph, Made by Holtzapffel & Co., London, with early printed instructional page reading in part Invented by Professor Willis, and constructed by Holtzapffel & Co.
Holtzapffel & Company Lacquered Brass Odontagraph, London, c. 1880, inscribed in script on the face Scale of Centres inside the Pitch Circle/W.H. Fisher 63/ Professor Willis's Odontagraph, Made by Holtzapffel & Co., London, with early printed instructional page reading in part Invented by Professor Willis, and constructed by Holtzapffel & Co.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
