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| | Patents for G09B 25 - Models for purposes not provided for in group , e.g. full-sized devices for demonstration purposes (6,311) | 
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 | 10/19/1976 | US3986278 Educational device for learning transmission drive shaft, and axle operation |  | 10/19/1976 | US3986277 Educational device for learning disc brake fundamentals |  | 10/19/1976 | US3986276 Educational device for learning suspension system fundamentals |  | 09/28/1976 | US3982330 Method and apparatus for simulating in a model the disbursement of gas and dust in a mine |  | 08/24/1976 | US3975835 Computer applications trainer |  | 08/10/1976 | US3973335 Apparatus to demonstrate air flow through permeable sheet material |  | 06/08/1976 | US3961426 Portable stage assembly |  | 05/11/1976 | US3955788 Apparatus for positioning and supporting optical laboratory instruments |  | 04/13/1976 | USRE28763 Computer teaching machine |  | 03/23/1976 | US3945132 Display system |  | 01/27/1976 | US3934356 Teaching aid for air conditioning apparatus | 
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