1	Operator
2	Driller
3	Mud Logger
10	Analyst,  The
20	Baroid
30	Birdwell
40	BPB
50	Brett Exploration
60	Cardinal
70	Century Geophysical
80	Charlene Well Surveying
90	Compagnie de Services Numerique
95	Comprobe
100	Computer Data Processors
110	Computrex
120	Core Lab
125	CRC Wireline,  Inc.
130	Digigraph
140	Digitech
145	Deines Perforating
150	Dresser Atlas
160	Earthworm Drilling
170	Electronic Logging Company
180	Elgen
190	El Toro
200	Empire
210	Frontier
215	Geolog
220	G O International
230	Gravilog
240	Great Guns Servicing
250	Great Lakes Petroleum Services
260	GTS
270	Guns
280	Halliburton
285	Horizon Production Logging
290	Husky
300	Jetwell
310	Lane Wells
320	Magnolia
330	McCullough Tool
340	Pan Geo Atlas
345	Perfco
350	Perfojet Services
360	Perforating Guns of Canada
370	Petroleum Information
380	Petrophysics
390	Pioneer
395	Q.C. Data Collectors,  Ltd.
400	Ram Guns
410	Riley's Datashare
420	Roke
430	Sand Survey
440	Schlumberger
450	Scientific Software
460	Seismography Service
470	Triangle
480	Welex
490	Well Reconnaissance
500	Well Surveys
510	Western
520	Westronics
525	Winters Wireline
530	Wireline Electronics
540	Worth Well