मैनुअल फ़ोरोप्टर, ऑप्टोमेट्रिक उपकरण, नेत्र क्लिनिक उपकरण, प्रौद्योगिकी, उपकरण, उद्योग, पृथक, मशीन का हिस्सा, मशीनरी, अभियांत्रिकी, चित्रण
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