Blackwood convention Blackwood convention In the partnership card game contract bridge, the Blackwood convention is a popular bidding convention that was developed by Easley Blackwood. It is used to explore the partnership's possession of aces, kings and in some variants, the queen of trumps, to judge more precisely whether slam is likely to be a good contract. Two versions of Blackwood are common: "standard" Blackwood, developed by Easley in 1933, and "Roman Key Card" Blackwood ("RKC" or "RKCB"), named for the Italian team which invented it. Standard Blackwood enables one partner to count partnership aces and kings in general. Key card variants
Atlas E/F The OIS upper stage was used for two Atlas E/F launches in 1979 and 1985, with the Solwind and Geosat spacecraft respectively. The rocket could place into low Earth orbit. The Atlas E/F was used between 1968 and 1971 to launch four groups of OV1 satellites, using OV1 upper stages. Each payload had its own upper stage. Three of the launches carried two OV1 satellites, and one carried three. Two of the launches also carried secondary payloads. In this configuration, the rocket could place into LEO. The PTS was used to launch the NTS-1 satellite on 14 July 1974. The