Has anyone ever noticed a manual for a Datum 9150-590 time code generator? The only ones that appear are for the more compact form airborne generators that are of later manufacturer. This unit is the full size (height, width, length) ARINC factor. MFG codes found put its manufacture to around 1978. I picked this unit up in basically brand new condition (no signs of use) many years ago, put it in storage and have just pulled it out for an application. It came with some organization internally generated notes referring to time synchronization steps required prior to a space shuttle launch. One note from initial acceptance calibration test indicated that it has 3/1000 second error per day. It also mentioned that this unit was designated as an operational spare. The internal SLA batteries need obvious replacement but the unit is fully functional. I usually try to find supporting documentation for all of the items that I acquire but finding a manual for this one has been a challenge. All of my other timing equipment has their associated manuals. Any help would be appreciated. Greg