OGO-2	KH-4		KH-4		KH-4A
KH-4A	KH-4A		KH-5		KH-6
Nimbus-2		PAGEOS		OGO-4
Samos-F2-4	Samos-F3-1
Samos-F3-1	Samos-F3-2		Poppy-3A			Quill
Ferret-C