The Bison 120 Channel 24000 Series Seismic Data Acquistion System with the Windows NT Graphical User Interface.  Two systems are available.  Please do not hesitate to contact me for a price quote. These two 120 channel Series 24000 systems are now being offered Burr Brown 24 bit A/D.  Systems are sold "as is".   The Systems are in working order.   If service and/or maintenance are required this may involve addtional cost, but can be accomplished at a later date.   Please do not hesitate to contact me if you are interested in this offer.  I am not sure how long these two systems will be on the market!   They have true 24 bit capability.    Written information is available if requested.