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1998 - Miller introduces the Dynasty™ 300 DX, a portable (90 lb.) AC/DC TIG inverter featuring an adjustable output
frequency (20 to 250 Hz), extended balance control (50 to 90 percent Electrode Negative) and Wind Tunnel Technology™.
Wind Tunnel Technology shields electrical components and PC boards from contamination by directing the cooling air in a
unique path; this significantly improves reliability.
View Wind Tunnel Technology™ Video
1999 - Miller introduces the PipePro™ 304, the world's first engine-driven
inverter, which has 5 to 375 amps of welding power (300 amps at 60 percent duty cycle) and CC/CV output capabilities. 
Benefits include superior arc performance in all welding processes and an excellent downhill pipe arc.
Miller introduces the Spectrum® 2050 portable inverter-type air plasma cutting and gouging system with Auto-Line™.
The exclusive Auto-Line circuitry offers simple, direct connection to any 50 or 60 HZ, single- or three-phase
primary power level from 190 to 630 VAC, enabling the system to operate in any work situation anywhere in the world.
2000 - Miller adds an electric power option to its PipePro 304 engine drive,
creating the first diesel engine-driven welding machine that also operates independently of the engine, using 230V,
single- or three-phase electric power.
Miller engineers integrate Auto-Line circuitry into the Maxstar 200 series of DC TIG/Stick inverters. Operating on 115
through 460 VAC primary power, this 37-lb. inverter provides unmatched location flexibility and portability for code
quality welds.
