Which cities were first connected by the STD services?

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Q: (SSC/0)
Which cities were first connected by the STD services?
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question_subject: 

Geography

question_exam: 

SSC

stats: 

0,2,10,5,2,3,2

keywords: 

{'std services': [1, 0, 0, 0], 'cities': [2, 1, 1, 1], 'kolkata': [1, 0, 1, 2], 'delhi': [4, 0, 4, 1], 'kanpur': [7, 0, 5, 12], 'mumbai': [1, 0, 1, 0], 'lucknow': [0, 0, 2, 1]}