the ARDC (Aeronautical Research & Development Corporation) had acquired Brantly Helicopter Corporation division from Lear Jet Industries in 1969,it also
developed the RP-440 flying-crane helicopter from Omega BS-12,the TP-900
was a three turbine helicopter developed from RP-440 and Omega BS-17 to
accommodate 14 passenger in detachable pod,also the project uses included
the carriage of freight,refrigerated cargo and pre-sorted mail.
here is anther helicopter actually built and developed from Omega BS-12,it was a twin
engined multi-purpose helicopter,called RP-440 and made by the same company,ARDC.
Jane's All the World's Aircraft 1969-70
Hmm..must have been a fore runner of today's Sikorsky sky crane.