The Feed Gear Brackets of models 41B and 42B machines underwent many design changes during the approximately 30 years that they were produced.The brands and types of solenoid valves that were used, the cylinders that moved the gearing, the physical arrangement of the devices and the tubing and electrical connections all changed extensively.Unfortunately, the documentation is not as good as might be hoped and the records of what specifically was used on a particular Serial Number is also remiss.

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