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|LEGO® → System → Service Packs|
|3 Ball and Socket Couplings, 1 Articulated Joint|
1123 3 Ball and Socket Couplings, 1 Articulated Joint is a Service Packs set released in 1978. The set includes eight parts, consisting of red 2 x 4 plates with hinges and yellow 1 x 4 plates with sockets.