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LCP
LEM
LTV
Lake Shore
Lambro
Lance Austin
Landis & Gyr
Lapp Insulator
Larsen
Lashmar
Lawson
Leach Relay
Leading Edge
Lee Electric
Leeson
Leviton
Lightalarms
Lightolier
Lithonia
Lunalite
Lutron
Lyons
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M & M Plastics
M & W
MAC Products
MGM Transformers
Madison Equipment
Magnetek
Major (Stagelighting)
Malcolite
Manhattan
Maple Chase
Mar-Bel
Markel
Mars
Marvin
Matra
Maxell
Meltric
McGill
Mennekes
Meyers
Michigan Hanger
Micron
Microswitch
Midstate Bolt & Nut
Midwest
Minerallac
Mono-Systems
Mulberry
Multi-Fittings
Murray
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NCI Products
NCC Corp.
Nehring
NEK Cable
NSI
National Pipe
National Tel-Tronics
Nelson
Newbasis
Newbrite
New Buffalo
New Yorker Steel Boiler
Nichifu
Nighthawk
Nova Dryer
Novitas
Nutone
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O.Z. Gedney/Neer Mfg.
OCAL
Olflex
Olson
Olympic
Omega Marking
Omni
Osaki
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PSG
PW Southern
Palco
Park Ohio Electric
Patton
Penn-Union
Penn Ventilator
Picoma
Pincor
Pirelli
Plastex
Plymouth Rubber
Polaris
Poly Pak Industries
Porcelain Products
Power Cord & Cable
Power Lighting
Power Strut
Powermax
Precision
Preformed Products
Prescolite (Atmos)
Pre-Wired Systems
Priority
Progress Lighting
Pryne (Emerson)
Pyramid
Pyrotector
Pyrotenax
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Q-Mark
Queen City
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RJM
RTE
Rack-A-Tiers
Raco
Radiant
Ramset/Red Head
Rapid
Rawl
Raychem (Tyco)
Raywall
Red Dot
Red Seal
Redi-Bolt
Relay & Control
Remcon
Remke
Republic
Rex
M.H. Rhodes
Rich Fans
Richards
Richco
Ripley
Rite-Touch
Robar
Robertson
Robroy/Stahlin
Rockbestos
Rome
Ronk Engineering
Royal
Rubbermaid
Russellstoll
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Saftronics
Salisbury
Sangamo
Sasson
Satco
Scepter
Selecta Switch
Sentinel
Shamrock
Shattershield
Siecor
Siemens
Simpson Strong Tie
Smart Box
Sofanou
Sola
Southern Grounding
Southern Pipe
Southwest Labs
Spectrum
Spiraduct
Sprague Capacitors
Spring City
Standard Electric Time
Standby Systems
Star Expansion
Steel City
Steel City Slotted Angle
Step by Step Guidebooks
Sterling Meters
Sumitomo
Sunbelt
Superior Electric
Superior Switch
Sure-Lite
Syntel
Systems Analyzer
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3-M
Talk-A-Phone
Tamaqua
Tapeswitch
Tappan
Taylor
Tek Tone
Thiel
Thepitt
Thermacoil
Thomas & Betts
Thomas Fasteners
Thor Enterprises, Inc.
G.C. Thorsen
Thunderstud
Time Mark
Topaz
Tork
Touchplate
TransUSA
Tyco ( Raychem )
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U.S. Anchor
USI
U.S. Expansion Bolt
U.S. Wire & Cable
Unenco
Universal Fastenings
Universal Insulator
Universal Security Instruments
Universal Testers (UEI)
Ushio
USPAR Lighting
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VACO
V.A.W.
Ventamatic
Venture Lighting International
Vikamatic
Virginia
Vynckier
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Walther
WD-40
WIKO
Wattstopper
Weaver
Weller
Wes-Garde
West Penn Wire
Wheatland
Wheelock
Whitney Blake
E.M. Wiegmann
Wiremold
Wiremold/Walker
Woodhead
Woods Wire
World Dryer
Wrap-On
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Yorklite
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Zenith
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