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In page Orange Group:

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In the 1970s, France attempted to make up for its delay in developing communications infrastructure, compared to other countries, by launching the programme "Delta LP" (increasing the main lines).[citation needed] It was at that time that the majority of the local loop was built (that is all the cables linking the users to the operator). Moreover, with the help of French manufacturers, digital switching -- Minitel and the GSM standard—were invented by engineers and CNET researchers.