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 H & L Instruments (NH)
 H B Registration Corporation (NJ)
 H F Scientific Inc (FL)
 H-B Instrument Co. (PA)
 H. O. Trerice Company (MI)
 Haake (NJ)
 Hach Company (CO)
 Haenni Instruments Inc (LA)
 Halliburton Energy Services (OK)
 Hammond Manufacturing (NY)
 Hampden Engineering Corp (MA)
 Hankison International (PA)
 Hanna Instruments Inc (RI)
 Hardy Instruments Inc (CA)
 Hardy Software Systems, Inc. (TX)
 Harlo Corporation (MI)
 Harrick Scientific Corporation (NY)
 Harris Environmental Systems (MA)
 HART Communication Foundation (TX)
 Hart Scientific (UT)
 Harwil Corporation (CA)
 Hathaway Process Control (ON)
 Hathaway Process Instrumentatn (TX)
 Haydon Switch & Instrument Inc (CT)
 Hays Cleveland (OH)
 HBM Div Spectris Tech (GA)
 HD Systems Inc (NY)
 Hedland Authorized Distrb (IL)
 HEI Corporation (IL)
 Heidenhain Corporation (IL)
 Helac Corporation (WA)
 Helicoid Instruments (CT)
 Helm Instrument Co., Inc. (OH)
 Hem Data Corporation (MI)
 HEMCO Corporation (MO)
 Hemiwedge (TX)
 Henderson Engineering Co Inc (IL)
 Heraeus-Sensor (PA)
 Hersey Measurement Co (SC)
 Hex Valve (OH)
 Hi-Gear Valves (CA)
 Hi-Techniques Inc (WI)
 Hinchest (UK)
 Hinds Instruments Inc (OR)
 Hirata Corporation of America (IN)
 Hirschmann, Inc. (NJ)
 HITEC Corporation (MA)
 Hitech Instruments (PA)
 Hitech Technologies, Inc. (PA)
 HMW Enterprises Inc. (PA)
 HNU Systems Inc (MA)
 Hobbs Corp (IL)
 Hoffer Flow Controls Inc (NC)
 Hoffman (MN)
 Hoke Incorporated (NJ)
 Holaday Industries Inc (MN)
 Hollis Controls Inc (NH)
 Holometrix Inc (MA)
 Homs Corp Douglas (CA)
 Honeywell's (IL)
 Honeywell IAC (AZ)
 Honeywell Limited (ON)
 Horner Electric (IN)
 Houston Atlas Inc. (TX)
 Howill Instruments, Inc. (FL)
 Hoyt Electrical Instr Works (NH)
 HSC Controls Inc (NY)
 HT Communications (CA)
 Hubbell Canada Inc. (ON)
 Humphrey Products Company (MI)
 Hunt Valve Company Inc. (OH)
 Hunter Lab (VA)
 Hunter Technology Corporation (CA)
 Huppert, K H Company Inc (IL)
 Hurst Manufacturing (IN)
 Hutton Communications Inc (TX)
 Hyberlab Corp. (ON)
 Hydroseal Valve Company, Inc. (TX)
 Hyett Mfg & Instrument Company (TX)
 Hygrometrix, Inc. (CA)
 Hypernetics Ltd (ON)

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