Eric F. Burtis

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Arithmetic training apparatus

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Machine for teaching reading

Education and demonstration – Language – Spelling – phonics – word recognition – or sentence formation
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Machine for teaching reading

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Mathematical problem and number generating systems

Oscillators – Relaxation oscillators
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Visual display with illuminable elements arranged in vertically

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
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Profile ID: LFUS-PAI-P-848849

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