മിന്നൽ രക്ഷാ ചാലകം കണ്ടുപിടിച്ചത് ?
Aബഞ്ചമിൻ ഫ്രാങ്ക്ളിൻ
Bചാൾസ് ബാബേജ്
Cവില്യം ഹണ്ട്
Dമാക്സ് പ്ലാങ്ക്
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