Bharti Airtel - Wikipedia

In 1984, Sunil Mittal started assembling push-button phones in India,[12] which he earlier used to import from a Singaporean company, Singtel, replacing the old-fashioned, bulky rotary phones that were in use in the country then. Bharti Telecom Limited (BTL) was incorporated and entered into a technical tie-up with Siemens AG of Germany for the manufacture of electronic push-button phones. By the

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インドの携帯事業者か。