Flow-Dyne Engineering Inc

In the late 1970s, HoffmanControls received two patents and introduced the first electronic analog variable air volume control system. HoffmanControls conceives, designs and manufactures special purpose electronic controls for commercial and industrial markets. The company designs and builds all of its tools, dies, moulds, castings, extrusions and test/calibration instrumentation. Its product line includes motor speed, motor protection, step and sequence controls, manual and variable motor/fan speed controls and digital (microprocessor) controls. HoffmanControls is located in Dallas.

Founded in 1951, Howell Instruments offers a range of engine monitoring and testing services to the aircraft industry. It offers the JETCAL analyzer, which assists in the testing of J47 engine temperature systems on the B-36 bomber. The company offers products and services for military and commercial corporations. It also manufactures and distributes digital instruments, engine trimmers, test sets and computer-based data acquisition systems. The company operates a service repair center, as well as maintains a referred engine diagnostic data. It provides a software program for conducting gas path analysis. In addition, Howell Instruments offers a variety of ground support equipment that includes auxiliary power unit, environmental control system, and brake and hydraulic pressure testers.