EXHIBIT 21.1SUBSIDIARIES OF PRIME
MEDICAL SERVICES, INC. 
AS OF February 18, 2004

|Name of Subsidiary(doing business as)                  | State of Incorporationor Organization
|------------------------------------------------------ | -------------------------------------
|Prime Medical Operating, Inc.                          | Delaware                             
|Prime Management, Inc.                                 | Nevada                               
|Prime Medical Management L.P.                          | Delaware                             
|Prime Service Center, Inc.                             | Delaware                             
|Prime Diagnostic Services, Inc.                        | Delaware                             
|Prime Lithotripsy Services, Inc.                       | New York                             
|(Reston Lithotripsy)                                  
|Prime Kidney Stone Treatment, Inc.                     | New Jersey                           
|(Indiana Lithotripsy)                                 
|Prime Diagnostic Corp. of Florida                      | Delaware                             
|Prime Lithotripter Operations, Inc.                    | New York                             
|(Tennessee Valley Lithotripter,                       
|Alabama Lithotripsy)                                  
|Prime Practice Management, Inc.                        | New York                             
|Alabama Renal Stone Institute, Inc.                    | Alabama                              
|Sun Medical Technologies, Inc.                         | California                           
|Lithotripters, Inc.                                    | North Carolina                       
|FastStart, Inc.                                        | North Carolina                       
|National Lithotripters Association, Inc.               | North Carolina                       
|MedTech Investments, Inc.                              | North Carolina                       
|Ohio Mobile Lithotripter, Ltd.                         | Ohio                                 
|ARKLATX Mobile Lithotripter, LP                        | Louisiana                            
|(Kidney Stone Center of Louisiana)                    
|TENN-GA Stone Group Three, LP                          | Tennessee                            
|Southern California Stone Center, L.L.C.               | California                           
|AK Specialty Vehicles, L.L.C.                          | Texas                                
|Mississippi Lithotripers LP                            | Mississippi                          
|Mobile Kidney Stone Centers, Ltd.                      | California                           
|Mobile Kidney Stone Centers II, Ltd.                   | California                           
|Mobile Kidney Stone Centers III, Ltd.                  | California                           
|Northern California Lithotripsy Associates             | California                           
|Northern California Kidney Stone Center, Ltd.          | California                           
|Lithotripsy Institute of Northern California           | California                           
|Fayetteville Lithotripters Limited Partnership -      
|Arizona I                                              | Arizona                              
|Fayetteville Lithotripters Limited Partnership -      
|Arkansas I                                             | Arkansas                             
|San Diego Lithotripters Limited Partnership            | California                           
|California Lithotripters Limited Partnership - II, LP  | California                           
|California Lithotripters Limited Partnership - III, LP | California                           
|California Lithotripters Limited Partnership - IV, LP  | California                           
|California Lithotripsy Joint Venture                   | California                           
|Florida Lithotripsy Limited Partnership I              | Florida                              
|Indiana Lithotripsy Limited Partnership I              | Indiana                              
|Pacific Medical of Hawaii Limited Partnership          | Hawaii                               
|Fayetteville Lithotripters Limited Partnership -      
|Louisiana I                                            | Louisiana                            
|Louisiana Lithotripsy Investment Limited Partnership   | Louisiana                            
|Montana Lithotripsy Limited Partnership I              | Montana                              
|Fayetteville Lithotripters Limited Partnership -      
|South Carolina II                                      | South Carolina                       
|Tennessee Lithotripters Limited Partnership I          | Tennessee                            
|Texas Lithotripsy Limited Partnership I                | Texas                                
|Texas Lithotripsy Limited Partnership III              | Texas                                
|Texas Lithotripsy Limited Partnership V                | Texas                                
|Texas Lithotripsy Limited Partnership VIII             | Texas                                
|Fayetteville Lithotripters Limited Partnership -      
|Virginia I                                             | Virginia                             
|Pacific Lithotripsy GP                                 | California                           
|Great Lakes Lithotripsy Partnership, LP                | Wisconsin                            
|Big Sky Urological Services, LP                        | Montana                              
|Wyoming Urological Services Ltd. Partnership           | Wyoming                              
|Washington Urological Services, L.L.C.                 | Washington                           
|Western  Kentucky Lithotripers LP                      | Kentucky                             
|Kentucky I Lithotripsy, L.L.C.                         | Kentucky                             
|Frontline Holdings, Inc.                               | Delaware                             
|Greater Atlanta Lithotripsy, L.L.C.                    | Georgia                              
|Utah Lithotripsy LP                                    | Utah                                 
|Dallas Lithotripsy LP                                  | Texas                                
|Red River Urological Services LP                       | Texas                                
|KCPR, LLC                                              | Texas                                
|SMIT Container B.V.                                    | Holland                              
|SMIT Mobile Equipment B.V.                             | Holland                              
|SMIT Carrosseriefabriek B.V.                           | Holland                              
|SMIT Hydrauliek B.V.                                   | Holland                              
|AK Specialty Vehicles B.V.                             | Holland                              
|AK Specialty Vehicles Ltd.                             | United Kingdom                       
|Winemiller Communications, Inc.                        | Delaware                             
|Aluminum Body Corporation                              | California                           
|ABC Merger, Inc.                                       | Delaware                             
|Prime Refractive, Inc.                                 | Delaware                             
|Metro Lithotripsy L.L.C.                               | Indiana                              
|Reston Lithotripsy L.P.                                | Virginia                             
|Prime Medical Manufacturing L.L.C.                     | Delaware