Visio Technical 4.0
Released in 1995 by Viso Corporation
For Windows 3.1 and 95/NT

Visio Technical is an edition enhanced to support technical drawings,
such as schematics, that are normally the domain of CAD programs.
Visio Technical 4 can also import and save AutoCAD files, and
supports multiple layers.

Contains both 16-bit Windows 3.1 and 32-bit Windows 95/NT versions.
Supports NT 3.51 and later.
