Abstract: A collapsible keyboard stand is described which also serves as its own carrying case. The keyboard stand includes (a) an upright support column which includes a cavity at each end, (b) a handle member attached to the column between its upper and lower ends, (c) an openable cover at the upper end of the column, (d) at least two arm members detachably mounted on the support column to define a horizontal support for a keyboard, (e) at least three leg members pivotably attached to the lower end of the support column. The leg members are pivotable to a position parallel to the longitudinal axis of the support column and can be slidably received within the lower end of the support column for storage. The arm members can be detached and placed into a cavity at the upper end of the column for storage and transport. The leg members support the column in a manner such that it leans forwardly.

Abstract: A miniature centrifugal separator for use in an engine air cleaner. Two cn air take-off tubes are coaxially aligned in the main flow tube for successively removing selected fractions of the outer annular portion of the swirling gas stream. The clean air tubes are spaced pre-selected distances downstream from the swirl means such that entrained dust particles are enabled to complete approximately one swirl revolution prior to encountering each take-off tube. The invention seeks to accomplish a relatively high collection efficiency with a relatively short flow tube.