Some objects were omitted in the development of the US Library for ARCHICAD 21. These objects are primarily 2d detail parts that may be missed when developing a new template for AC21.
If you are migrating a project from AC20 to 21, do NOT use this library, as these objects should all be part of the standard migration library. This LFC is intended for use as a supplemental addition to your custom library to add back in objects that were left out in the out of the box AC 21 US library.
These are all GRAPHISOFT developed library parts extracted from the ARCHICAD 20 US Library by fellow ARCHICAD guru, Geoff Briggs of Seattle, WA.