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- Chemistry--Study and teaching1
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- Educational toys1
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- Electric apparatus and appliances1
- Electricity1
- Electron tubes1
- Geo. Borgfeldt & Company1
- Harmonic Reed Corporation1
- Lionel Corporation1
- Magic1
- Magic shows1
- Magic tricks--Equipment and supplies1
- Midgetlab Company1
- Pasteur, Louis, 1822-18951
- Telegraph1