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DE2330684A1
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Electronic organ control for multiple production - requires as many oscillators as voices and changeover switches
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CA971264A
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Construction panel for building up electrical and electronic circuits
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US3608209A
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Educational game
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ES363327A1
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An instructive optical toy. (Machine-translation by Google Translate, not legally binding)
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ES363328A1
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A computer for instructive and didactic purposes. (Machine-translation by Google Translate, not legally binding)
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US3574954A
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Optical educational toy
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US3568335A
|
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Educational computer
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GB1206181A
|
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Apparatus for supporting an experimental electrical device
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FR1532325A
|
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Electrical connection box, especially for experimentation
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