User’s Manual Model GD402 Gas Density Meter IM .
GD4029B - Synchronous Up/Down Counter
GD402 - Gas Density Meter Manual
GD4027B - Dual JK F-F
GD4021B - 8-Bit Shift Register
GD4028B - 1 of 10 Decoder
GD402SD - SURFACE MOUNT SCHOTTKY BARRIER DIODE
GD4023B - Triple 3-Input NAND Gate