70
Robotics Invention System Upgrade Kit (1.5)
Reference: #3803 · released in 1999
Themes: Mindstorms › RCX
The LEGO Robotics Invention System Upgrade Kit (1.5) set came out in 1999 in the Mindstorms and RCX themes. This construction set holds 70 parts and represents a robotics system.
This set from LEGO includes a total of 70 parts distributed across 25 distinct unique parts.
Set parts (25)
![Technic Axle Connector Ridged [with x Hole x Orientation]](https://static.toytrust.app/brands/img/lego/elements/6538b/7.jpg)
![Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]](https://static.toytrust.app/brands/img/lego/elements/32054/1.jpg)
![Rubber Belt Small [15mm ID] [Round Cross Section]](https://static.toytrust.app/brands/img/lego/elements/85543/15.jpg)
![Technic Rubber Belt Medium [26mm ID] [Round Cross Section]](https://static.toytrust.app/brands/img/lego/elements/85545/1.jpg)
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