History · Indian History
When was the STD (Subscriber Trunk Dialing) service first introduced in India, and between which cities?
- 11960, between Lucknow and Kanpur✓
- 21972, between Delhi and Bangalore
- 31986, between Mumbai and Pune
- 41995, between Kolkata and Haldia
Correct answer
1960, between Lucknow and Kanpur
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