Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
William Bridge
Peter Edward Trainer
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Individual
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Individual
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Publication of GB189812090ApublicationCriticalpatent/GB189812090A/en
12,090. Bridge, W., and Trainer, P. E. May 27. Drawings to Specification. Protractors.-An educational appliance for use in teaching designing, which consists of a square piece of card, celluloid, &c. having a circular hole through it, may be ruled on one side to form a protractor.
GB189812090D1898-05-271898-05-27Improved Kindergarten Tool or Appliance for Educational purposes.
ExpiredGB189812090A
(en)