enerCHRON – Energy Chronicle

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The energy app enerCHRON shows historical events, inventions and discoveries.

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1907 Helicopter
1905 Theory of Relativity
1896 Radioactivity
1888 Alternating-current electric motor
1887 Radio waves

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trim(): Passing null to parameter #1 ($string) of type string is deprecated | /html/enerthek_util/dynamic/data_functions.inc.php (Line: 254)
trim(): Passing null to parameter #1 ($string) of type string is deprecated | /html/enerthek_util/dynamic/data_functions.inc.php (Line: 250)
trim(): Passing null to parameter #1 ($string) of type string is deprecated | /html/enerthek_util/dynamic/data_functions.inc.php (Line: 254)
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