Under an ERDA contract, comparative evaluations of fuel feeding systems under development for coal conversion plants have been made and recommendations with respect to further work on each are made. Under another part of the contract, feasibility studies are being made with respect to a coal extruder or ''pump''based on the plastic properties of coal. Based on a poor response to letters of interest to industrial companies with respect to this project, JPL has proposed to ERDA that JPL buy an extruder and test it in-house with consulting help from the extruder manufacturer. (LTN)