Info required on Futaba VFD displays

[Henry Swanepoel]

HI there

I am looking for information on the following VFD displays salvaged
from a Sharp Desktop Calculator:

13-digit with following markings:

Futaba
13-BT-52ZS1 3C
13-BT-52

9-digit with following markings:

Futaba
9-ST-52A1 3B
9-ST-08

A search on Futaba's website produced no results as well as searhing
via Google.

I can determine the segments, filament connections and grids by
looking at the VFD but would like to know typical voltages, etc.

I am crossposting because I had no reply in
sci.electronics.components.

Regards,

Henry Swanepoel