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| a wooden frame |
| a stationary "bed" where the type was held |
| a "tympan" to hold the parchment |
| a "platen" to press the type to the parchment |
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a screw impression mechanism to lower and
raise the platen |
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| a change to a cast iron frame |
| a moveable bed |
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a variety of changes to the impression
mechanism |
| * toggle - used in the Washington |
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* power-increasing levers - used in the Stanhope
and the Columbian |
| * lever-and-chill - used in the Albion |
| * torsion toggle - used in the Stansbury |
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* equal-length levers - used in the Wells and the
Smith |
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