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Curtis Instruments - Series 906 - Battery 'Fuel' Guage
Curtis Instruments - Series 900R - Battery 'Fuel' Gage
Curtis Instruments - Series 802 - Solid State Battery 'Fuel' Gauge & Hour Meter
Curtis Instruments - Series 803 - Battery 'Fuel' Gauge & Hour Meter with Lift Lockout
Curtis Instruments - Series 700 - Solid State Hour Meters & Counters