General Knowledge · Inventions and Discoveries
उस वैज्ञानिक का नाम बताइए जिसने पहले व्यावसायिक रूप से व्यावहारिक, लंबे समय तक चलने वाले तापदीप्त प्रकाश बल्ब (incandescent light bulb) का आविष्कार किया था?
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