Prototyping

CAD Programs — Neustel Law Offices. Computer aided drafting packages for inventors. Some are free.
Prototyping — EURO ENGINEERING CO. "...Builds mechanical prototypes and devices.". Free estimates available.
Inventor Mentor — About Jack Lander. Jack is also a prototype machinist and materials expert.
Prototyping — Retronix Inc. Retronix provides engineering services: consulting, product development, prototyping, and production. Retronix can work from a patent, a detailed narrative, drawings or a crude prototype.
Rapid Prototyping — C.R., Conceptual Reality L.L.C. Procedures, equipment, part production, engineering services.
Prototyping — PRIMO MACHINE Co. "...Builds mechanical prototypes and devices.". Free estimates available.