Cine a inventat o masina de arat care necesita puterea a 12 boi, Gr. Avram, Ion Constantinescu, Cate tone de petrol pt lampat Bucurestiul sau produs, 276 de tone de petrol, 275 de tone de petrol, Cine a produs rafinaria care producea ptrolul, Teodor Mehedințeanu, Valeriu Pușcariu, Virgiliu Tacit, frații Marin, Cine a fost inventatorul trenului cu abur?, Virgiliu Tacit, Teodor Dragu, Traian Vuia, Teodor Mehedințeanu, In ce an a fost prezentat primul avion la PARIS?, 1890, 1910

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