Ray E. Prescher

• Plumbing & HVAC manhour estimates
• 1994 national plumbing & HVAC estimator
• 1997 National Plumbing&Hvac Estimator (1997)
• 1996 National Plumbing and Hvac Estimator/Disk (National Plumbing&HVAC Estimator (W/CD))
• National Plumbing & Hvac Estimator
• National Plumbing and Hvac Estimator 1998
• National Plumbing and HVAC Estimator, 1993