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Displays for Calculators: FG Series

 
FG series multi-digit VFD
ID: FG Series
Type: Vacuum Fluorescent Display (VFD), ten to twelve digit with possible symbol cluster
Maker: Itron
Typical date range: Late 1970s
Package: Flat face glass body
Date coding system: unknown
Notes:

The FG115H is an 11 digit display tube. 
Vf: Heater supply voltage
Sa-g: segment control
SDP: decimal point control
G1-G11: Digit grids

The FG138L7 is a 12 digit display tube. with a symbol cluster consisting of an "I" "II", "E" and "-".  Each digit has a lower comma. Used in: Sanyo CY3421DP
Vf: Heater supply voltage
a-g: segment control
DP: decimal point control
Comma: Comma control
D1-D12: Digit grids
D13: Symbol grid
Pins 2-5: Symbol control