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 Bulletin of Tenders  Free Market

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The plus character "+" is used in front of the international dialing code.
A space character separates the international code from the remaining digits.
The remaining digits should be presented as a single block.
An extension number should be separated from the main number by hyphen "-".
When indicating more than one telephone number, separate them using a slash. In this case the international dialing code of the following phone numbers can be omitted.
When indicating consecutive numbers in an abbreviated manner use a slash.
+49 12345678
+49 12345678-0001
+49 12345678/79/80/81
+49 12345678/+49 987654321/+49 998877665