Matches 1 - 31 out of 31


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3711207 ISODENSITY RECORDING SYSTEM  
An improved density recording system is described in which a material carrying a density pattern thereon is scanned two-dimensionally to measure its density, the output of the density measurement...
3711860 ARC DISCHARGE RECORDING APPARATUS WITH PIGMENT CARRIER  
A high speed recording system has a belt of dielectric material with an aperture therein and a drive means for the belt to move the aperture across a recording surface of a recording medium along a...
3633289 RECORDING DEVICE OF STUDENT LEARNING PROCESS  
A branched teaching machine that selects frames for presentation to the student in accordance with individualistic responses is connected to the remote control of a rotatable slide projector and...
3517546 DETECTOR CONFIGURATION FOR THE ULTRASONIC LEAK DETECTOR  
3413653 Acoustic leak detecting apparatus  
3409897 Recorder for detecting and locating leaks in pipelines by ultrasonic vibration  
3189819 Method for detecting the presence of cathodic protection currents on pipelines  
3185997 Pipe collar locator  
3162505 Device for locating pipeline leaks  
3117453 Apparatus and method for making internal surveys of pipelines  
3099817 Vehicle performance monitoring system  
3064127 Pipe line survey instrument  
3016733 Pipeline leak surveying  
2997361 Selective electrostatic character printing  
2982186 Apparatus for making perforated sheet material  
2980854 Pipeline surveying  
2971259 Method and apparatus for determining the position of sewer leaks  
2970299 Electrographic recording with magnetic material  
2928708 Signal recording system  
2918580 Electrographic printing head  
2907622 Oscillographic recorders  
2893810 Recorder mechanism  
2892150 Thickness gauge  
2869965 Electro-sensitive digital data plotter  
2863711 Recording  
2860756 Information translating apparatus  
2806756 Recording apparatus  
2796314 Recorders  
2791746 High speed recorder  
2782370 Pipe line instrument  
2779654 Graphical recording systems  
Matches 1 - 31 out of 31