I got me a list of lawn mower manufacturers.

Adriatica-Grifo
AEBI
AEBI North America
AerWay
Agri-Fab
Agria-Werke GmbH
AGS
AL-KO
Alamo Industrial
Alkota
Allen Power Equipment
Allett Mowers
Alroh Turf Machinery Services
ALTO
American Lawnmower Co.
Ammbusher
Antonio Carraro
Ardisam
Ariens
Atco
Atom Industries
B & H Manufacturing
Bachtold Bros.
Bad Boy Mowers
Baldor Electric
Bandit Industries
Bannerman
Barreto Manufacturing
BCS
Befco
Belrobotics
Benassi
Bercomac
Better Outdoor Products
Big John Tree Transplanter
Billy Goat Industries Inc.
Bishop Enterprises
Black and Decker
Blec
Blount
Bluebird International
Bob-Cat Turf
Bobcat
Bolens
Borderline Stamp
Bosch
Bri-Mar
Briggs & Stratton
Brill
Brinly-Hardy Co.
Brouwer Turf
Brown Manufacturing
Broyhill
Buhler
Bunton
Bush Hog
C.J. Industries
California Trimmer, Inc.
Caravaggi SRL
Carlton Company
Caron Srl
Caroni
Carter Bros.
Champion
Cifarelli
Classen Manufacturing
Coleman
Comet Industries
Concrete Edge Company
Countax
Country Clipper
Country Manufacturing
Cub Cadet
Curtis Tractor Cab
Cushman
D&M Machine Division Inc.
Dana
Deines Manufacturing
Dennis Mowers
Deutz
DewEze Manufacturing
Digga     Boring
Dirt Killer
Ditch Witch
Dixie Chopper
Dixon Mowers
Dolmar
DR Power Equipment
E-Z Trench
Earth&Turf
Earthway
Easy Lawn
Echo
Echo BearCat
ECI Engine Co Ltd
Edgetec International
Electric Tractor Corporation
Electrolux Home Products
Electrolux International
Elgee Mfg
Eliet
EMAK
Encore Power Equipment
Etesia
Eurosystems S.P.A.
EverRide
Excel/Hustler
Exmark
Fairbanks Morse Engines
Farymann Diesel
Farymann USA
Ferris
Finn Corp.
First Products Inc.
Fisher Beavertail Mfg,
Flymo
Friendly Machines
Fuerst
Gandy
Garber
Garden Groom
Gardena
Generac
Gianni Ferrari
Giant-Vac
Ginge
Gizmow
Glenmac Inc
Goizper
Goldoni
Goossen Industries
GP Turfcare Inc
Grasshopper
Gravely
Great Dane
Greenfield Mowers
Griffiths & Beerens (GB)
Grillo
Ground Hog, Inc.
Grounds Maintenance Equipment
Hai Yung Enterprise Co., Ltd
Harry
HATZ
Havener Enterprises
Hayter Mowers
Herd Seeder
Hesko
Hinowa S.P.A.
Hoffco
Holder
Homelite
Honda Power Equipment
Honda Japan
Honda Europe
Hover Mower
Howard
Howard Rotovator
Hudson
Hudson Sales & Engineering
Hurlimann
Husqvarna International
Husqvarna Canada
Hydro Turf, Inc.
Hydro-Gear
Ingersoll
International Tool Service
IRUS Motorgeräte
ISEKI
Isuzu
Jacobsen
Jetman Power Products
John Deere
Jonsered
JRCO
K & W Products
Kaaz Corporation
Kadco
Kanga Loaders
Karcher Canada
Karcher
Kawasaki Motor Corp
Kees
Kesmac
KingKutter
Klippo
Kohler Engines
Komatsu Zenoah
Kromer
Kubota
Kunz Engineering, Inc.
Kut-Kwick
KW Manufacturing
Kyoeisha
KÖPPL
Lambert Manufacturing
Lamborghini
Land Pride
Landa
Laski
Lastec
Lawn Breather Ltd
LawnBoy
LG Industrial Systems
Lister-Petter- Americas
Little Beaver
Little Wonder
Locke
Lombardini
M-B Companies
M-C Mathews Co.
M.E.Y. Equipment
MA.RI.NA Systems
Macauto Industrial Co. Ltd
MacKissic Inc.
Magnatrac (C.F. Struck Corp)
Makita
Mantis
Marolex
Maruyama
Massey Ferguson L&G
Maxim Manufacturing Corp.
McConnel
McCulloch
McLane Manufacturing
McMurtry Ltd.
Mi-T-M
Mikuni
Millcreek Manufacturing Co.
Mitsubishi Engine
Monarch
Morbark
MOSA
Mountfield
MTD
Muck-truck
Mulch Mule
Munroe Tufline
Mustang Manufacturing
National Mower Co.
New Holland
NGK
Noah Mowing System
Novae Corporation
OFAB Rotary Cutters
Ohio Steel
Onan (Cummins)
Oregon     Saw chain,
Original Tractor Cab
Parker
Partner
Patriot Products, Inc
PECO Inc.
Peerless
Perkins
Peruzzo
Phelon
Plugr
Posch
Poulan
Power King/Economy
Power Trac
Power Trim Co. Inc
Prairie Habitats Inc.
Precision Products Inc.
Professional Lawn Equipment
Progressive Turf Equipment
ProMow     Gang Reel Mowers
Protea Turf Equipment
Protero Inc
PSB Company
Pubert
Quadivator Inc
RAD Technologies
Ramrod Equipment
Ransomes Jacobsen
Rapid
Rayco
Red Roo
Reform
Reinco
Remington
Rhino
Rittenhouse & Sons Ltd
Robin
ROBOT
Roof
Root-Lowell Manufacturing
Rotomec
Rover Mowers Ltd
Rugged
Ruggerini
Ryan
Ryobi
S.E.P.
Sabo
Salsco
SAME
Samurai
Sarlo
Saukville Tractor
Saylor Industries, Inc.
Scag
SCH
Schulte
SDMO
Self Guided Systems,
Seppi M.
Sharpex
Shibaura
Shindaiwa
Simplicity
Simplicity Europe
SISIS Equipment
SISIS U.S.
Smithco
Snapper
Snuffer
Solo
Solo USA
Southland Mower
Speedex
Split-Fire Sales Inc
SPLITez
Spyker
Steiner
Stiga
Stihl
StrikeMaster
Sunrise Concepts
Sutech
Sweepster
Swisher
Tanaka
Tandem Lawn Industries
Target
Tecumseh
Terramite
Texas
Texas Sod Harvesting Equipment
Tillotson
TMC Power Equipment
Toro
Torrential
Trac-Vac
Trailmate
Triton
Troy-Bilt
Tru Mark
Trust Development
Tuff Torq
Turbo Turf
Turf Teq, LLC
Turfco
Turflex Industries
Turfmaster
Turfmaster Industries Inc
Tygar Mfg Inc
UnderWunder
USPraxis
Vandermolen
Venture Products Inc.
Vermeer Manufacturing
Walbro
Walker
Weedeater
Weems Wagon Works
Whipper-Clipper
White (MTD)
Windsor
Wisconsin Motors,
Wood Bay Enterprises
Wood/Chuck Chipper Corp.
Woodland Power Products
Woods
Worksaver
WorldLawn Power Equipment
Worx
Wright Manufacturing
Yamaha
Yanmar
Yard Marvel
Yardman (MTD)
Yazoo/Kees
York Modern Corp.
Yung Chi Y.C. Industrial Co.
Zama
Zenith Fuel Systems
Zipper Mowers

Now I just need to figure out who they all are.