The 19th G7 summit included politicians .
The summits were not meant to be linked formally with wider international institutions ; and in fact , a mild rebellion against the stiff formality of other international meetings was a part of the genesis of cooperation between France 's corporate magnate Giscard d'Estaing and West Germany 's entrepreneur Helmut Schmidt as they conceived the first Group of Six , G6-summit in 1975 .
19th G7 summit