What specific action did Bertha Benz take in 1888 to validate the engine's practicality?

Answer

She undertook the world's first long-distance road trip (Mannheim to Pforzheim and back).

Bertha Benz took the improved Patent-Motorwagen on a grueling trip of about 66 miles (106 km) one way to provide a real-world durability test for the engine.

What specific action did Bertha Benz take in 1888 to validate the engine's practicality?

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The FIRST IN 1886 | BEFORE MERCEDES, THERE WAS BENZ

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