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Making process of Display unit
Latch register circuit
Mounting of latch registers and a diode matrix
In the improvement this time, I changed the letter of the category, too.
The place which the diode mounts is marked with the red pen.
The diode can be mounted without making a mistake in this way.
A latch register board is installed between the control circuit board and the diode matrix board.
This is in the condition that all modifying was complete.