Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Manual assembly technique of discrete building-block parts. (Left) Snap-fit features allow reversible joints and disassembly while still providing sufficient attachment to allow load transfer. (Right) Slot-type connections allow vertical assembly of intersecting planes and part types.
