LEGO Technic I 1031 Technical Functions Simple Machines Activity Card Set

For use with the 1983 LEGO Technic I Technical Functions Simple Machines School Set, which was sold separately. 20 double-sided activity cards to help children explore the technical functions of simple machines. 1030 LEGO Technic I Technical Functions Simple Machines School Set, and the 1035 Technic Teacher's Guide for Technic I sold separately.