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| All Patents in class 177/220 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,993,592 | Mar. 05, 1935 | F.M. Carroll | Weighing scale | ||
 | 2,607,580 | Aug. 19, 1952 | M.W. Romig | Pendulum scale | |
| 3,436,968 | Apr. 08, 1969 | E.D. Bright, P.I. Unger | Processing Control System | ||