File:Thomas Edison putting his signature in the wet concrete of memorial block at Dearborn, Michigan. Henry Ford on left. (6bb8a67a32e34063a76476650a381056).jpg
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![File:Thomas Edison putting his signature in the wet concrete of memorial block at Dearborn, Michigan. Henry Ford on left. (6bb8a67a32e34063a76476650a381056).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Thomas_Edison_putting_his_signature_in_the_wet_concrete_of_memorial_block_at_Dearborn%2C_Michigan._Henry_Ford_on_left._%286bb8a67a32e34063a76476650a381056%29.jpg/800px-Thomas_Edison_putting_his_signature_in_the_wet_concrete_of_memorial_block_at_Dearborn%2C_Michigan._Henry_Ford_on_left._%286bb8a67a32e34063a76476650a381056%29.jpg?20240102061153)
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