File:Child's platform on springs by Campbell in 1922.png
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DescriptionChild's platform on springs by Campbell in 1922.png |
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. |
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Patent 1,509,750 of the U.S. Patent and Trademark Office |
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Author | Helen Campbell | |||
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current | 18:22, 28 August 2011 | 1,810 × 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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