उद्योग, पौधा, उत्पादन, फ़ैक्टरी, विनिर्माण, धातु, इस्पात मिल, नियंत्रण कैबिनेट, मैकेनिकल इंजीनियरिंग
Public Domain
प्रासंगिक तस्वीरें
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