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3576426 THERMOSTATICALLY CONTROLLED ELECTRIC AQUARIUM WATER HEATER  
A water heater for home aquariums, the device being adapted for partial immersion in the aquarium water. It comprises a casing the upper portion of which has a multiple-size bracket for attachment...
3571544 MAGNETIC KEY OPERATED SWITCH FOR ELECTRICALLY OPERATED HAND TOOLS  
This invention relates to a switch for electrically operated hand tools, and the like, wherein the contact points of the switch are normally maintained yieldably separated, and one arm of said...
3569645 TAMPERPROOF SWITCH DEVICES FOR BURGLAR ALARM SYSTEMS, AFFORDING CORDLESS CONNECTIONS ACROSS PROTECTED STATION SEPARATIONS  
The fundamental switch unit interposed in a conductor included in the circuit, comprises a permanent magnet carried for example on a door, and an armature carried on a door frame, so when the door...
3567880 SUBMARINE SIGNALLING DEVICE AND FAIL-SAFE SWITCH  
A submarine detonation device comprises a sea water switch and/or a fail-safe switch. The sea water switch comprises an anode, a cathode and a floodable interelectrode interspace. The fail-safe...
3563123 NIBBLING MACHINE CONTROL DEVICE  
A control device for a nibbling machine is formed of an eccentric shaft, means mounted on and rotatable with the shaft for opening and closing a switch, and a switch member spaced radially outward...
3564171 REED SWITCH DEVICES  
The invention relates to a reed switch device wherein a bar magnet is mounted in such a way that the on-off switch differential is minimized. The device may be used to respond to changes in speed,...
3562735 ROTATION SENSING DEVICE  
3560846 MAGNETIC PROXIMITY DETECTOR  
3559124 MAGNETICALLY ACTUATED REED SWITCHES  
3559062 RADIAL READOUT GAUGE HAVING COOPERATING VISUAL AND AUTOMATIC SIGNIFICATION MEANS  
3556012 MAGNETIC PROBE FOR TOW TRUCKS  
A magnetic switch actuating apparatus for use in a tow truck system includes two horizontal probe mounting members disposed on either side of the tow pin of a truck at the front end of the truck....
3555221 PURGING LIQUID SUPPLY SENSOR  
A float including a magnet is mounted in a chamber for vertical travel in a liquid body, with a control switch adjacent the path of travel of the magnet for opening and closing of the switch in...
3550448 ELECTRONIC THERMOMETER UNIT  
3546404 SWITCH ACTUATED BY FLUID FLOW  
3541485 CONTROL DEVICE FOR ELECTRICAL BODY CARE  
3539957 MAGNETIC SWITCH  
3538274 PNEUMATIC MEASURING SYSTEM INCLUDING A PNEUMOELECTRIC RELAY  
3538272 DETECTOR OF VEHICLE PRESENCE AND PASSAGE  
3536875 FLUID PRESSURE OPERATED MAGNETIC SWITCH  
3533028 ELECTRIC KEY SWITCHING UNIT  
3533026 ELECTROCHEMICAL APPARATUS  
3531260 FLUID-COOLED CHUCK WITH A FREEZE-THROUGH SENSOR  
3527904 UNBALANCE CONTROL MEANS FOR CLOTHES TREATING APPARATUS  
3525060 REED CONTACTS OPERABLE BY MAGNETIC FORCES  
3517699 MAGNETIC-PNEUMATIC PROXIMITY SWITCH  
3512601 AUTOMATIC GUIDANCE SYSTEM FOR VEHICLES  
3510813 DEVICE FOR ACTUATION OF REED SWITCHES  
3510816 TEMPERATURE-DIFFERENTIAL PRESSURE SWITCH  
3510607 IMPULSE ACTUATED REED SWITCH  
3507359 LUBRICATING SYSTEM  
3504235 SOLID STATE LIMIT SWITCH  
3503020 MAGNETIC PROXIMITY SWITCH  
3500082 DRIVE UNIT FOR FLEXIBLE SHAFTS  
3496500 MAGNET CONTROLLED FLUID-PROOF CONNECTOR  
3495236 TRANSDUCER  
3491317 MAGNETICALLY OPERATED REED SWITCH  
3487346 MAGNETIC SWITCH  
3486143 MAGNETIC SWITCHES  
3483492 REED SWITCH  
3478184 VALVE-SWITCH ASSEMBLY FOR USE IN INTRAVENOUS FEEDING  
3471665 MAGNETIC REED FLOAT SWITCH FOR USE WITHIN THE INTERIOR OF A LIQUID CONTAINER HAVING A REMOVABLE INSTALLATION FEATURE  
3470547 SWITCHING CROSSPOINT ARRANGMENT  
3465327 ARRANGEMENT FOR INDICATING POSITION OF AN ADJUSTING MECHANISM MOUNTED ON A ROTATABLE MEMBER  
3465271 MAGNETIC SWITCHING DEVICE  
3464047 TEMPERATURE-INCREASE WARNING DEVICE  
3462569 SENSING SWITCH SYSTEMS  
3461874 ELECTRIC CAUTERY  
3459911 INERTIA SWITCH WITH MAGNETIC SHUNTING  
3452170 ALARM SWITCHING DEVICE FOR VARIABLE RESTRICTION FLUID FLOW METERS  
3451053 REMOTE POSITION SENSING AND MEASURING DEVICE