File:Child's platform on springs by Campbell in 1922.png

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Description

These are the patent drawings for a device intended for amusement and exercise for babies and small children. The inventor was Helen Campbell of Yakima, Washington.

The 1924 U.S. patent for this device was applied for in 1922. Its patent number is 1,509,750.
Date
Source

Patent 1,509,750 of the U.S. Patent and Trademark Office

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Author Helen Campbell
Permission
(Reusing this file)
Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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current18:22, 28 August 2011Thumbnail for version as of 18:22, 28 August 20111,810 × 2,782 (116 KB)DavidMaisel (talk | contribs){{Information |Description= These are the patent drawings for a device intended for amusement and exercise for babies and small children. The inventor was Helen Campbell of Yakima, Washington. The 1924 U.S. patent for this device was applied for in 192

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