World Book Encyclopedia (Just in case the link below is not working)
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Photography |
Telegraph |
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Barbed Wired |
Bessemer Process |
Steel Plow |
Internal |
Steel Windmill |
Typewriter |
Light Bulb |
Electric Motor Explain that Stuff
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Electric Streetcar |
Telephone |
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Phonograph |
Airplane |
Radio |
X-Ray Machine |
Sewing Machine |
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