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HRT: Arrhythmia Research Technology, Inc. engages in the licensing of medical software, which acquires data and analyzes electrical impulses of the heart to aid in the detection of potentially lethal arrhythmias. It offers PREDICTOR, a signal-averaging electrocardiographic software. The company, through its subsidiary, Micron Products, Inc., also manufactures and distributes silver plated and non-silver plated conductive resin sensors used in the manufacture of disposable integrated electrodes constituting a part of electrocardiographic diagnostic and monitoring instruments, as well as distributes metal snap fasteners used in the manufacture of disposable electrodes. In addition, the company manufactures, sells, or leases electrode assembly machines to its sensor and snap customers; and manufactures sensors and conductive plastic studs used in the manufacture of radio translucent electrodes. Further, Arrhythmia Research Technology involves in custom injection molding; defense industry subassembly and metal component manufacturing; the design, manufacture, and rehabilitation of injection molding tools; and the manufacture of custom manufactured metal medical devices. Additionally, it provides medical diagnostic services, including cardiac event monitoring and mobile cardiac telemetry services. The company's customers include manufacturers of disposable snap type, radio translucent, and pre-wired electrodes. It operates primarily in the United States, Canada, Europe, and the Pacific Rim. Arrhythmia Research Technology, Inc. was founded in 1981 and is based in Fitchburg, Massachusetts.

MSA: Mine Safety Appliances Company engages in the development, manufacture, and sale of safety products to protect workers in fire service, homeland security, oil and gas, construction, and other industries, as well as in the military worldwide. It offers respiratory protection products, including self contained breathing apparatus, air-purifying respirators, gas masks, and escape hoods that are used to protect against the harmful effects of contamination caused by dust, gases, fumes, volatile chemicals, sprays, micro-organisms, fibers, and other contaminants; and portable and permanent gas detection instruments, such as single and multi-gas hand-held detectors, multi-point permanently installed gas detection systems, flame detectors, and open-path infrared gas detectors that are used to detect the presence or absence of various gases in the air. The company also provides hand-held infrared thermal imaging cameras that detect the sources of heat to locate downed firefighters and other people trapped inside burning or smoke-filled structures; head, eye, face, and hearing protection products, which include industrial hard hats, fire helmets, military helmets and communication systems, and protective eyewear; and body protection products consisting of fall protection equipment and ballistic body armors. In addition, it offers a range of consumer and contractor safety products. The company's safety products integrate the combination of electronics, mechanical systems, and materials to protect users against hazardous or life threatening situations. Mine Safety Appliances Company markets its products directly, as well as through distributors and retailers. The company was founded in 1914 and is based in Cranberry Township, Pennsylvania.

SPAN: Span-America Medical Systems, Inc. engages in the manufacture and distribution of various therapeutic support surfaces and related products utilizing polyurethane and other foam products for the medical, consumer, and industrial markets in the United States and Canada. Its medical products consist of polyurethane foam mattress overlays; therapeutic support surfaces, which include non-powered and powered therapeutic support surfaces; patient positioners; seating products; and Selan skin care creams and lotions for health care facilities, including acute care hospitals, long-term care facilities, and home health care providers. The company offers pressure management products, including Geo-Matt, PressureGuard, Geo-Mattress, Span-Aids, Isch-Dish, and Selan products. Its consumer product line consists primarily of convoluted and contour-cut mattress overlays, and pillows for the consumer bedding market; and industrial product line includes foam products used in various industries, such as water sports equipment, automotive, photographic film, durable goods, and electronics industries. The company was founded in 1970 and is based in Greenville, South Carolina..