A More Accurate Serial Number List

Any attempt to synthesize a larger document from a small smattering of facts always leaves accuracy open to question. The suggested serial number list is based on my personal interpretation of the information gathered. This list, while far less detailed, uses only those aspects of the research which I felt were most likely to be accurate. All of the serial number ranges except for the first are approximations.

Serial Numbers Comments

Additionally, there are at least two patent dates that can be found on York instruments. Obviously, instruments bearing these dates would not have been made prior to the patent date shown on the instrument:

1996 by John J. Swain

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