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Proton launches in 1973

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January
April
May
July
August

January 1973

8 Jan
Luna 21
Proton

April 1973

3 Apr
Salyut 2
Proton

May 1973

11 May
Kosmos 557
Proton

July 1973

21 Jul
Mars 4
Proton
25 Jul
Mars 5
Proton

August 1973

5 Aug
Mars 6
Proton
9 Aug
Mars 7
Proton

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