Safety compass
School utensil and toy robot
Scribe/guide tool adapted for stair construction
Scriber-compass with spring-loaded center punch
Scribing device and method
Shape and envelope cutting system
Skater's device
Sliding surface for a drafting board
Standard parallel rule with perspective drawing device
Straight edge assembly
Straightedge
Straightedge supporting device for rail type drawing instrument
Stud alignment tool
Support device, especially for eyeglass frames
Switch control of a master-slave power supply for preventing res