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Summary
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.
Tags
patents
patent drawings
us patent office
precursors to balance boards
united states patent drawings
high resolution
inventions
Date
1922
Source
USPTO
Link
Copyright info
public domain