A brake lining wear warning system in which passages are formed at a predetermined depth in the lining and connected to the engine intake manifold through a vacuum switch. The switch operates a warning indicator when there is insufficient vacuum in the passages. When the lining wears to open a passa ...
A diaper is disclosed wherein the structure comprises an absorptive substrate wherein the amount of expressible moisture within the central section of the substrate is reduced relative to contiguous peripheral sections either by reduction in weight of absorbent material per unit of surface area or b ...
An electronic calculator apparatus capable of storing a plurality of multidigit numbers and of performing operations with respect to those numbers. Operations are defined by two levels of instructions; i.e.; (1) a user level specified by keyboard actuations, and (2) an internal or microprogrammed le ...
A nonresilient container for a pressurized primary fluid and an internal collapsible resilient holder for a secondary fluid, the fluids being placed in fluid mixing communication in a slidable valve stem by a resilient valve member which is of a compliance and construction such that a normal valve s ...
For enabling a variable frequency electric power inverter to ride through a temporary loss or reduction of input power, means is provided for sensing an excursion of DC bus voltage beyond a predetermined normal magnitude range and for deriving first and second signals respectively proportional to th ...
Connection members for constructional systems, based on extrusions having at least one channel formation in at least one of the sides thereof, are characterized by having a base member which fits into the channel formation of one extrusion and at least one side member which fits into the channel for ...
A collapsible folding bookcase construction for separate desk or tabletop use and as a sectional unit to be releasably assembled with like units, a foldable unit having hinged back, side, and bottom panels and an assembly or connector flap, the side panels having recessed fastener means for joining ...
Method and apparatus for assisting a failing heart by sucking blood out of the left ventricle during normal systolic action, while at the same time blocking flow to the aorta, and during diastolic action, when the aortic valve is closed, forcing blood into the aorta and thence to the arterial tree. ...
A water treatment system having a scanner circuit which monitors and controls and takes corrective action upon receiving signals from pH-sensing apparatus, conductivity-sensing apparatus, or corrosion rate sensing apparatus, singly or together, and provides electrical timing means for stopping or st ...
Multipliers produce a signal having a magnitude proportional to the sum of the squares of the rotary flux vectors and the induced three phase voltage vector of an asynchronous three phase machine by first producing signals having instantaneous magnitudes proportional to flux components of voltages i ...
