What hides this stereogram?

Stereogram - 3D Image

#brainteasers #stereogram #3Dimage

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Lead Balloon

My grandfather invented the cold air balloon...
It never really took off.

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Edison patent

In 1880, Thomas A. Edison was granted a U.S. patent for his invention of an "Electro-Chemical Receiving-Telephone" (No. 231,704).

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