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[edit] Summary

A circular chart recorder.

U.S. Patent 5,019,838 , figure 3

[edit] Licensing

In general, the contents of United States patents are in the public domain.[1]

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A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.

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