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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 6995556 | Electromagnetic gage sensing system and method for railroad track inspection An electromagnetic gage sensing system having sensor heads positioned over each rail of a railroad track that measures both rail gage and height distance above the rails of a railroad track. Each sensor head includes an array of electromagnetic field generating coil... | 02/07/2006 |
| 5353512 | Measuring arrangement for continuously measuring undulatory irregularities of a rail A measuring arrangement (2) for continuously measuring undulatory irregularities in the running surface (4) of a rail (5) of a track (6) comprises a measuring trolley (1) having flanged wheels (8) which are able to roll on the track (6) and a trolley fram... | 10/11/1994 |
| 4391134 | Measuring apparatus for rail head running surface irregularities A measuring carriage for measuring the undulations and ripples of a worn rail head running surface is guided along the rail head by a pair of guide rollers laterally guiding the carriage along a portion of the gage side of the rail head which is not worn ... | 07/05/1983 |
| 4173073 | Track displacement detecting and measuring system A track displacement detecting and measuring system in which track displacement data are obtained as usual for a unit chord length of the track according to the conventional three-point measuring method by sensors mounted on three predetermined parts of a... | 11/06/1979 |
| 4075888 | Measurement of undulatory wear along railroad tracks To measure undulatory wear of the rails, a carriage moving along a railroad track has three measuring bases formed by girders each supported on two rollers and each having a rail sensor providing a measurement of deformation of the rail intermediate the s... | 02/28/1978 |
| 4005601 | Apparatus for detecting rail discontinuities Apparatus and technique for use on a moving rail vehicle to detect, measure and record rail surface and side discontinuity by means of sensors mounted at intervals on the rail vehicle undercarriage. The sensors may be of the contact or non-contact variety... | 02/01/1977 |
| 3990154 | Apparatus for measuring the lateral distance between adjacent tracks In an apparatus for measuring the lateral distance between adjacent tracks, a measuring axle has a wheel which is selectively engageable without play with a selected rail of one track while a pivotal projecting arm associates therewith has laterally movab... | 11/09/1976 |
