JOHNSON

AIR COMPRESSORS; PNEUMATIC PRESSURE SWITCHES FOR OPERATING DEVICES IN ACCORDANCE WITH PRESSURE CHANGES; PNEUMATIC TRANSMITTERS FOR TRANSMITTING PRESSURE CHANGES REPRESENTING CHANGES IN ENVIRONMENTAL CONDITIONS AND PNEUMATIC RECEIVERS FOR ACCEPTING PNEUMATIC INPUT SIGNALS FROM A PNEUMATIC TRANSMITTER AND OPERATING DEVICES IN ACCORDANCE WITH THE PRESSURE CHANGE AND PARTS AND COMPONENTS FOR ALL OF THE FOREGOING