Map reading and plotting instrument

Marine azimuth and intercept plotter instrument

Mechanism for controlling the displacement of a straight edge on

Method for determining type size

Miter gauge

Monitor device

Navigation position plotter

Navigational aid device

Navigational aid device for determining direction in a chart

Navigational calculating device

Navigational calculating device

Navigational plotter

Orthographic to axonometric plotting apparatus

Parallel rule

Parallel ruler

Parallel straightedge

Parallel-ruling straightedge

Perspective drafting apparatus

Perspective drafting instrument

Perspective drawing alignment apparatus