डाक टिकट, लेखन, कार्यालय की आपूर्ति, उपकरण, घर के अंदर, कार्यालय, मशीनरी, क्लोज़ अप, एकल वस्तु, काम कर रहे, प्रौद्योगिकी
Public Domain
प्रासंगिक तस्वीरें
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