गियर, यांत्रिक, धातु, मशीन, प्रौद्योगिकी, कोगवील, अभियांत्रिकी, उद्योग, इस्पात, घड़ी की कल, प्रस्ताव
Public Domain
प्रासंगिक तस्वीरें
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