Garden row marker
Gear socket structure for a designing rule
Geometric construction device
Geometric instrument and method of making same
Graphic recording system
Guide for ellipse construction
Guide for hand tools
Guide for tool or instrument
Guide line holder
Hand device for determining vehicle position
Harmonograph
Holder for lead insert and needle for a compass
Ice surface line applicator
Illuminated progressive lens marker
Infinite radius circle drawing instrument
Infinitely variable drawing instrument
Instrument for drawing ellipse or the like
Instrument for drawing geometric figures
Instrument for making perspective drawing
Instrument for tracing curved figures particularly ellipses