Family-owned Carroll Custom Machining grew from owner George F. Jarrard’s nearly 50 years in machining and R&D. Established in Carroll County after his 2016 retirement, the company is known for working closely with inventors and engineers to turn challenging ideas into prototypes ready for testing or presentation.
Hopkins Machine CompanySince beginning as a teenage machinist in 1963, Charles Hopkins has built Hopkins Machine Company into a Middletown Valley prototype shop handling everything from historic engine reconstruction to precision CNC machining. The small, owner-operated company works from sketches or 3D models, reproduces obsolete parts, and takes on short-run projects rather than production volumes. Hopkins’s background includes Army machinist training and machining work in aerospace, medical, and automotive reconstruction.MIDDLETOWN, MD
ProtoSpark LLCFounded by father and son Jose and Giovanni, family-owned ProtoSpark LLC is a Brooklyn machine shop that turns ideas into working prototypes through CNC machining, 3D printing, and mechanical design. The shop serves both individual inventors and established companies, pairing hands-on manufacturing experience with fast turnaround and collaborative communication. ProtoSpark also offers beginner-focused CNC training for people entering modern fabrication.BROOKLYN, NY
Brandt's Custom MachiningStarted by father-and-son partners Tony and Ben Brandt in 2008, Brandt’s Custom Machining is a family-owned Mansfield job shop making custom precision-machined and OEM parts. The company has grown from one machine in a rented warehouse section to a 10,000-square-foot facility with more than 35 machines, while completing over 2,000 projects. Its nine-person team also handles fixture assembly, product design, and machine rebuilding for American manufacturers.MANSFIELD, OH