BALOMETER by TSI INCORPORATED (Track this)
Intl: (009) Electrical and scientific apparatus US: 026 Filing date: 11-Mar-1983 Serial number: 73416880
VELOMETER by TSI INCORPORATED (Track this)
Intl: (009) Electrical and scientific apparatus US: 026 Filing date: 02-Apr-1982 Serial number: 73357963
COALOMETER by MERRICK INDUSTRIES, INC. (Track this)
Intl: (009) Electrical and scientific apparatus US: 023; 026 Filing date: 13-Nov-1980 Serial number: 73285728