Method and device for drawing curved lines

Method and device for the measurement of angles on space planes

Method and means for centerless circle construction

Method for designing of aproximate elliptical structure and...

Method for reading the shape of any elastically deformable artic

Method of measuring eyeglass frame, an apparatus for the...

Multi-function drafting instrument

Multi-function level

Multi-function measuring apparatus

Multi-purpose drawing instrument

Multipurpose tool

Navigation plotter

Navigational computer

Oval compass

Oval cutter

Oval cutter

Pair of measuring compasses

Pattern developing tool

Patterngraph apparatus

Pendulum design machine