Proton

Proton ('proton') was a Soviet series of four cosmic ray and elementary particle detecting satellites. Orbited 1965–68, three on test flights of the UR-500 ICBM and one on a Proton-K rocket, all four satellites completed their missions successfully, the last reentering the Earth's atmosphere in 1969.

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artificial satellite, 
Ashkenaz, Calvinist Republic of Ghent, Chinland, Havilah, Kingdom of Martabam-hongsawatoi, Kingdom of Wolaita, Persia, Sikh Confederacy, Sweden, Tarshish, Dong Fang Hong 2, Ekran, [[Proton|]], 

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Location: KML, Cluster Map, Maps,

Frameless

Schematic of the Proton satellite

The Soviet Union 1967 CPA 3460 stamp (Satellite Proton 1. Pavilion and Emblem at Expo '67) cancelled

The Soviet Union 1967 CPA 3460 stamp (Satellite Proton 1. Pavilion and Emblem at Expo '67)

USSR 1968-11-16 airmail cover

P42345701

Type	Subtype	Date	Description	Notes	Source
commons	image		Schematic of the Proton satellite		Commons
commons	image		The Soviet Union 1967 CPA 3460 stamp (Satellite Proton 1. Pavilion and Emblem at Expo '67) cancelled		Commons
commons	image		The Soviet Union 1967 CPA 3460 stamp (Satellite Proton 1. Pavilion and Emblem at Expo '67)		Commons
commons	image		USSR 1968-11-16 airmail cover		Commons
commons	image		P42345701		Commons