Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 11, 2018
Patent Application Number
15134063
Date Filed
April 20, 2016
Patent Citations Received
Patent Primary Examiner
Patent abstract
A teaching device includes a base and a first set of equipment. The first set of equipment includes a first rod portion including a first spiraling rod portion installed in the base. A first encircled object is disposed on the base plate and is encircled by the first spiraling rod portion. Also included is a first rod slider. The first rod slider is slidably movable along the first rod portion and around the first encircled object.
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