طباعة بوصلة جيروسكوبية حاصلة على براءة اختراع باللون الأسود غير اللامع (5 بوصة × 7 بوصة) M11289
مميزات خاصة
- Printed on Acid-free heavyweight Midnight Blue Matte Paper
- Printed using archival inks meant to last years
- Your selection fits a 8.5" x 11" Frame or can be matted or hung on your Wall without a Frame.
- Midnight Blue color
وصف
This is a reproduction of the original Patent for a Gyroscopic Compass.
It was invented by Elmer A. Sperry and filed on June 21, 1911. It was issued on September 17, 1918 by the United States Patent and Trademark Office.
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