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Apparatus and didactic method for teaching and showing primary o

Education and demonstration – Science – Astronomy
Patent

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Apparatus and method for finding and identifying nighttime sky o

Education and demonstration – Science – Astronomy
Patent

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Apparatus for demonstration of earth's rotation about the sun

Education and demonstration – Science – Astronomy
Patent

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Astronomical display apparatus

Education and demonstration – Science – Astronomy
Patent

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Automatic tracking astronomical globe

Education and demonstration – Science – Astronomy
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