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Top of front page of Frank Gray's US patent 2632058, showing PCM tube 10 with plate 15 in reflected binary code pattern.

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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	Date/Time	Dimensions	User	Comment
current	04:19, 10 September 2006	1,600×1,114 (159 KB)	Dicklyon (Talk \| contribs)	(Top of front page of Frank Gray's US patent 2632058, showing PCM tube 10 with plate 15 in reflected binary code pattern. )
	04:18, 10 September 2006	1,600×1,114 (159 KB)	Dicklyon (Talk \| contribs)	(Top of front page of Frank Gray's US patent 2632058, showing PCM tube 10 with plate 15 in reflected binary code pattern. )