| ABC Industries, Inc |
808 |
| ABC Ventilation Systems |
2000 |
| AECOM |
1700 |
| Aerix Industries (formerly Cellular Concrete) |
1603 |
| Agru America, Inc |
1701 |
| Akkerman |
2001 |
| Alpine Equipment |
1414 |
| Amberg Engineering (North America), Inc |
2301 |
| Amberg Technologies AG |
2303 |
| American Chemical Technologies, Inc |
2006 |
| American Innotek |
1213 |
| American Mine Research, Inc |
204 |
| Amix Systems Ltd |
2108 |
| Antraquip Corp |
1707 |
| Arup |
2201 |
| Atkins North America |
1424 |
| Atlas Copco CMT-USA |
1607 |
| Avanti International |
700 |
| Babendererde Engineers, LLC |
511 |
| Ballard Diving & Hyperbaric Services |
611 |
| Baroid Industrial Drilling Products (IDP) |
409 |
| BASF Construction Chemicals LLC |
1706 |
| Becker Mining America |
514 |
| Bekaert Corp |
704 |
| Black & Veatch |
1202 |
| Boart Longyear E&I Drilling Services |
1314 |
| Brokk Inc |
311 |
| Brookville Equipment Corp |
2008 |
| Cambria County Assn for Blind & Handicapped |
209 |
| Caterpillar Tunneling Canada Corp |
2103 |
| CDM Smith |
702 |
| CETCO |
417 |
| ChemGrout, Inc |
411 |
| Cosella-Dorken Products, Inc |
1801 |
| COWI NA |
1302 |
| Crux Subsurface, Inc |
610 |
| CTS Cement Manufacturing Corp |
302 |
| Daigh Company, Inc |
1808 |
| Datwyler Sealing Technologies Deutschland GmbH |
306 |
| David R. Klug & Associates, Inc |
300 |
| Decon USA Inc |
1214 |
| Delcan-GEODATA |
103 |
| DeNeef Construction Chemicals, Inc |
505 |
| Derrick Equipment Co |
2307 |
| Dibit Measuring Technique USA, Inc |
607 |
| Dr. Sauer & Partners Corp |
513 |
| DSI |
315 |
| Elasto Plastic Concrete |
1802 |
| Everest Equipment Co |
1322 |
| Fibercon International, Inc |
1402 |
| Gall Zeidler Consultants |
1806 |
| Geocomp/GeoTesting Express |
1803 |
| Geo-Instruments, Inc |
101 |
| Geokon, Inc |
1428 |
| Givens International Drilling Supplies, Inc |
109 |
| GMS Mine Repair & Maintenance |
1223 |
| Gomez International, Inc |
1304 |
| Green Mountain International, LLC |
1211 |
| Grindex Pumps |
1406 |
| Halfen Anchoring Systems |
901 |
| Hatch Mott MacDonald |
308 |
| Hayward Baker Inc |
1705 |
| Heintzmann Corp |
1906 |
| Helix: Micro-Rebar |
711 |
| Herrenknecht Tunnelling Systems USA, Inc |
403 |
| HIC Fibers, Inc |
606 |
| Hitachi Zosen Corp |
1306 |
| HNTB |
2321 |
| Hobas Pipe USA |
1703 |
| Hughes Brothers Inc |
1905 |
| ILF Consultants, Inc |
605 |
| Instantel |
1212 |
| Irwin Car and Equipment |
1412 |
| Itasca Consulting Group, Inc |
515 |
| J.H. Fletcher & Co |
200 |
| Jacobs Associates |
2309 |
| JADCO Manufacturing, Inc |
1408 |
| Jennmar Corp |
613 |
| Kaydon Corp Bearings Division |
706 |
|
| King Shotcrete |
614 |
| Laborers & Tunnel Contractors Training Trust |
1215 |
| Lachel & Associates, Inc |
510 |
| Langan Engineering & Environmental Services |
312 |
| Layne Geo |
1324 |
| Line Power |
303 |
| Maccaferri Inc |
1900 |
| Malcolm Drilling Co Inc |
1904 |
| Mapei Corp |
1206 |
| McDowell Equipment Ltd |
2106 |
| MCT Murer Consult GmbH |
710 |
| Measurand Inc |
1205 |
| Messinger Bearings |
1807 |
| M-I Swaco, A Schlumberger Co |
1210 |
| Midwest Industrial Supply, Inc |
604 |
| MineARC Systems |
2207 |
| Mining Equipment Ltd |
2100 |
| Mining Technologies International, Inc (MTI) |
2203 |
| Moretrench |
508 |
| MWH Global |
1601 |
| Naylor Pipe Co |
203 |
| Nexans AmerCable, Inc |
1426 |
| Nicholson Construction Co |
602 |
| Normet Americas, Inc |
1800 |
| North American Tunneling Journal |
600 |
| Orica USA Inc |
1702 |
| Pacchiosi Drill USA, Inc |
1312 |
| Parsons Brinckerhoff |
501 |
| Parsons Corp |
1422 |
| Paul C. Rizzo Associates, Inc |
1410 |
| Pemco Corp |
107 |
| Permalok Corporation |
213 |
| Plaxis bv |
810 |
| Powerking Corporation |
202 |
| Pultrall Inc |
1216 |
| Putzmeister Shotcrete Technology |
2325 |
| QSP Packers, LLC |
410 |
| Rasa Corp |
2007 |
| Reimers Systems, Inc |
907 |
| Richway Industries |
207 |
| Rocscience, Inc |
2009 |
| RST Instruments Ltd |
215 |
| Ruen Drilling, Inc |
601 |
| S&B Industrial Minerals North America Inc |
709 |
| Sandvik Mining and Construction |
2319 |
| Schauenburg Flexadux Corp |
201 |
| Schnabel Foundation Co |
1400 |
| Schwing Bioset, Inc |
1220 |
| SELI SPA |
206 |
| Shaft Drillers International |
1221 |
| Shannon & Wilson, Inc |
2004 |
| Shotcrete Technologies, Inc |
603 |
| Shurjoint Piping Products |
1907 |
| Sika Corporation |
2323 |
| SIREG SPA |
1204 |
| SOLDATA |
1217 |
| Spendrup Fan Co |
408 |
| Stirling Lloyd Products, Inc |
1225 |
| Surecrete Inc |
507 |
| tacs gmbh |
905 |
| Team Mixing Technologies, Inc |
1316 |
| Technical Tunnelling Components LTD (TTC) |
314 |
| TEI Rock Drills, Inc |
309 |
| Tenbusch, Inc |
903 |
| The Euclid Chemical Co |
1909 |
| The Robbins Co |
703 |
| TLT-Babcock Process Fan Group |
1901 |
| Trelleborg Ridderkerk BV |
1902 |
| TREVIICOS Corp |
1207 |
| Tunnel Business Magazine (TBM) |
1903 |
| Tunnels & Tunnelling |
415 |
| URS Corp |
1430 |
| VMT GmbH |
1310 |
| W. R. Grace & Co |
503 |
| Williams Form Engineering Corp |
612 |
| Wisko America, Inc |
1222 |
| World Tunnelling Magazine |
1804 |
| Xypex Chemical Corp |
105 |
| Zed Tunnel Guidance Ltd |
1320 |
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