Image Item No. Description  32021c01 (Inv)  Code Pilot Catalog: Parts: Electric, Programmable  32023  Code Pilot - Bottom Battery Cover Catalog: Parts: Electric, Programmable  32021c00  Code Pilot - Brick Top with Green Battery Holder Catalog: Parts: Electric, Programmable  53788  Mindstorms NXT - Complete Brick with Dark Bluish Gray Base Catalog: Parts: Electric, Programmable  32109  Mindstorms RCX Brick Bottom Cover 8 x 12 Catalog: Parts: Electric, Programmable  x124  Mindstorms RCX Remote Control Catalog: Parts: Electric, Programmable  70288  Technic Control 4.5V Interface Box with Ports (1986 Version) Catalog: Parts: Electric, Programmable  70455  Technic Control 4.5V Interface Box with Ports (1987 Version) Catalog: Parts: Electric, Programmable  2840c01  Technic Control Center I Catalog: Parts: Electric, Programmable  2840c02  Technic Control Center II Catalog: Parts: Electric, Programmable