- Jacobs Engineering Group
 - Pasadena - Offers a full-spectrum of professional technical services to industrial, commercial, and government clients across multiple markets. - National Technical Systems@
- Calabasas
- Acentech Incorporated
- Canoga Park - Acoustical consulting firm with over 40 years of experience. Services in architectural acoustics, noise and vibration control, audio/visual systems design and environmental acoustics.
- Isograph Reliability Software
- El Segundo - Software tools for the reliability, maintenance, and safety includes reliability centred maintenance, fault tree analysis, and availability simulation software.
- Bluebeam Software, Inc.
- Pasadena - Invents and develops desktop software applications specifically designed to meet the needs of engineers and architects.
- Sensortronics, Inc.
- Covina - Manufacturer of force measurement sensors, including load cells, torque sensors, accelerometers and related instrumentation.
- LR Environmental Equipment Co. Inc.
- Buys, sells, and trades used, refurbished industrial ovens, environmental test chambers, and QA test equipment.
- CEC Vibration Products
- Covina - Manufacturer of vibrometers, accelerometers and related vibration analysis equipment used for monitoring vibration, acceleration, displacement, and temperature.
- Group Delta Consultants
- Torrance - Small, minority-owned, geotechnical engineering firm in Southern California with offices in Los Angeles, Orange, and San Diego Counties.
- Marshall Long Acoustics
- Sherman Oaks - Engineering consultants in acoustics, noise and vibration control, sound system design, and related areas.
- Martin Newson & Associates, LLC
- Santa Monica - Offers acoustical consulting services including architectural and environmental acoustics and noise and vibration control.
- Wenzlau Engineering
- Pasadena - Engineering solutions for the protection and mobilization of sophisticated electronic systems.
- Thorburn Associates
- Burbank - Acoustical consulting and audiovisual system engineering.
- bd Systems
- Aerospace engineering and information systems services for government and industry.
- Farwest Corrosion Control Company
- Gardena - Cathodic protection company offering corrosion control materials, engineering design, and systems installation. Also gives educational seminars.
- Environment Associates
- Chatsworth - Sales and rentals of used and reconditioned environmental simulation test chambers and vibration equipment for qualification and reliability tests.
- SoHaR Incorporated
- Research, development, and consulting organization specializing in software and hardware reliability issues. Products include MEADEP and SCAT.
- Symvionics, Inc
- Pasadena - Provider of systems engineering and technical assistance (SETA) to U.S. government & aerospace industries.
- Quilite Noise Barriers
- Features a cost effective alternative to common block walls in controlling noise in commercial and industrial applications.
- Granite Precision Inc.
- Valencia - Services to the entertainment and amusement park industry including show/ride control, technical design and documentation, VFX and video/graphics matting, custom engineering, and software programming.
- Plasma Technology, Inc.
- Torrance - Engineered solutions which mitigate wear, oxidation, and corrosion.
- Sherwin Incorporated
- South Gate - Manufactures penetrants and related products used in the non-destructive testing of critical components in the aerospace and welding industries.
- Fire Alarm Drafting Service
- Azusa - Fire alarm drafting providing blueprints and full colour presentation drawings.
- Imodco
- Calabasas - Supplies terminals for loading/offloading tankers based on the single point mooring principle.
- Material Innovations, Inc.
- Torrance - MII has material testing and fabrication capability to support any materials engineering program.
- Keck-Craig, Inc.
- Pasadena - Industrial design and product development firm with emphasis on applying the fundamentals of engineering to improve product design.
- Advanced Industrial Materials (AIM)
- City of Industry - Produces whiskers, powders, electronic substrates, and provides hot pressing, spray drying, and other materials processing services.
- Durkee Testing Laboratories
- Paramount - Specializing in totally customizable analytical, physical, and metallurgical testing.
- Analysts, Inc.
- Torrance - Services include ferrography, spectrochemical analysis, physical properties, and other ASTM testing techniques.
- T-2 Design Corporation
- Santa Monica - Helps inventors with product design and development, prototypes, patent searching, and market placement.
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