What is the significance of X-Series patents in the MPEP?

What is the significance of X-Series patents in the MPEP? The MPEP 901.04 provides information about X-Series patents: “X-Series patents were issued from the early 1800’s through the middle 1830’s.” Key points about X-Series patents: They represent some of the earliest patents issued in the United States These patents were issued before the modern numbering…

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