General Knowledge · General Knowledge
'थर्मस फ्लास्क' का आविष्कारक कौन है?
- 1लॉरेंस
- 2जेम्स डेवार✓
- 3रिचर्ड ट्रेविथिक
- 4विलियम कोजेन
सही उत्तर देखें
जेम्स डेवार
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