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A LITTLE SOMETHING WORTH KNOWING

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TechnologyOne small ahaInvention

Walter Hunt patented a version of this clothing fastener with a spring and a clasp shielding its sharp point.

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Your new ahaThe Safety Pin

The Safety Pin: Added a protective clasp to the simple straight pin. Source: Safety pin

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    John Walker's friction match made fire far easier to produce, though he never patented it.

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  2. 26Edison's 1877 invention was the first device to both record sound and play it back.IDENTIFY
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    Thomas Edison's phonograph was the first device to both record and play back sound.

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  3. 27Cai Lun is traditionally credited with improving the manufacture of this lightweight writing material in China.IDENTIFY
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    Papermaking, traditionally credited to the ancient Chinese official Cai Lun, gave the world an affordable writing surface.

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