| Patents for G01C 5 - Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels (3,586) |
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| 09/09/1980 | US4221483 Laser beam level instrument |
| 08/26/1980 | US4218919 Apparatus for measuring elevation |
| 07/29/1980 | US4215334 Aircraft excessive descent rate warning system |
| 07/29/1980 | US4214373 Grade checker |
| 05/29/1980 | WO1980001106A1 Device for levelling-in |
| 05/06/1980 | CA1077159A1 Excessive sink rate warning system for aircraft |
| 05/06/1980 | CA1076830A1 Static friction free altimeter |
| 04/29/1980 | CA1076687A1 Below glide slope advisory warning system for aircraft |
| 04/08/1980 | US4196623 Depth gauges |
| 04/01/1980 | CA1074554A1 Optical rangefinding apparatus |
| 02/19/1980 | US4189777 Ground proximity warning system with means for altering warning threshold in accordance with wind shear |
| 02/19/1980 | CA1072195A1 Helicopter warning system |
| 02/12/1980 | CA1071740A1 Terrain closure warning system with altitude rate signal conditioning |
| 01/29/1980 | CA1070803A1 Glide slope warning system with a variable warning rate |
| 01/22/1980 | CA1070140A1 Pressure sensor for determining airspeed, altitude and angle of attack |
| 12/27/1979 | WO1979001122A1 Underwater levelling device |
| 10/02/1979 | US4169320 Leveling device |
| 09/18/1979 | US4167876 Methods and apparatus for determination of terrestrial settlement profiles |
| 07/17/1979 | US4161069 Elongated flexible level for use as transit |
| 07/10/1979 | CA1058306A1 Excessive descent rate warning system for aircraft |
| 07/10/1979 | CA1058305A1 Negative climb rate after take-off warning system with predetermined loss of altitude inhibit |
| 04/17/1979 | US4149321 Mercury leveling instruments |
| 04/17/1979 | CA1052891A1 Circuitry for encoding altimeter |
| 03/27/1979 | US4145817 Elevation measuring apparatus |
| 03/13/1979 | US4144571 Vehicle guidance system |
| 03/06/1979 | US4142800 Automatic level |
| 01/23/1979 | US4135817 Apparatus for measuring an aircraft's speed and height |
| 01/23/1979 | US4135403 Electronic altitude encoder |
| 01/09/1979 | US4133209 Altimeter |
| 12/19/1978 | US4130360 Laser altimeter/profilometer apparatus |
| 11/21/1978 | CA1043005A1 Aircraft ground proximity warning instrument |
| 10/17/1978 | US4121287 Alarm filtering in a ground proximity warning system |
| 10/17/1978 | CA1040416A1 Surveying instrument for establishing a point in a plane and method of use |
| 10/10/1978 | US4119382 Self-leveling construction alignment laser |
| 10/03/1978 | CA1039535A1 Terrain closure warning system with climb inhibit and altitude gain measurement |
| 09/05/1978 | CA1038066A1 Alarm filtering in a ground proximity warning system |
| 08/22/1978 | US4107996 Pressure gauge |
| 08/22/1978 | US4107995 Recorder for decompression data |
| 08/15/1978 | US4106343 Solid state barometric altimeter-encoder |
| 06/27/1978 | US4096744 Pressure sensor for determining airspeed, altitude and angle of attack |
| 05/23/1978 | US4090781 Mirror orienting device for a laser levelling instrument |
| 05/09/1978 | US4087920 Two-fluid tiltmeter |
| 04/04/1978 | US4082466 Optical sighting instrument |
| 03/28/1978 | US4081730 Multiple function generator for aircraft flight instruments |
| 03/28/1978 | US4081214 Low altitude optical altimeter |
| 03/14/1978 | US4078911 Measurement of elevations in a float glass facility |
| 03/07/1978 | US4077257 Depth Gauge |
| 01/31/1978 | US4071894 Profile warning generator with anticipation of warning condition |
| 11/29/1977 | US4060793 Excessive sink rate warning system for aircraft |
| 10/18/1977 | US4054052 Aircraft instrument with acceleration compensation device |
| 10/11/1977 | US4053238 Self-leveling construction alignment laser |
| 10/11/1977 | US4052902 Static friction free altimeter |
| 09/06/1977 | US4047001 Encoding altimeter |
| 08/16/1977 | US4041613 Hydrostatic level instrument |
| 06/14/1977 | US4030065 Terrain clearance warning system for aircraft |
| 06/07/1977 | US4027838 Helicopter warning system |
| 06/07/1977 | US4027397 Mobile track surveying apparatus |
| 05/31/1977 | US4027143 Encoding altimeter |
| 05/31/1977 | US4026156 Vertical displacement measuring apparatus |
| 05/17/1977 | US4023414 Altimeters |
| 04/05/1977 | US4016565 Aircraft ground closure rate filtering method and means |
| 02/01/1977 | US4006472 Aircraft altitude alerting device |
| 01/18/1977 | US4003263 Tube profile gage |
| 12/14/1976 | US3997267 Laser apparatus for projecting a narrow beam of light as a reference line |
| 11/23/1976 | US3992948 Diver information system |
| 10/26/1976 | US3988713 Aircraft ground proximity warning instrument |
| 09/07/1976 | US3979717 Helicopter warning system |
| 09/07/1976 | US3978730 Indicating instruments |
| 08/03/1976 | US3972623 Laser reference device |
| 07/20/1976 | US3970391 Direction determining method and apparatus |
| 06/01/1976 | US3961272 Encoding altimeter |
| 06/01/1976 | US3960453 Electronic telescopic sight |
| 05/25/1976 | US3958459 Barometric altimeter |
| 05/18/1976 | US3958219 Terrain closure warning system with altitude rate signal conditioning |
| 04/13/1976 | US3949484 Vertical movement detection systems |
| 03/30/1976 | US3947810 Negative climb rate after take-off warning system with predetermined loss of altitude inhibit |
| 03/30/1976 | US3947809 Below glide slope advisory warning system for aircraft |
| 03/30/1976 | US3947808 Excessive descent rate warning system for aircraft |
| 03/23/1976 | US3946358 Aircraft ground proximity warning instrument |
| 03/16/1976 | US3944968 Aircraft ground proximity warning system having speed versus altitude compensation |
| 03/16/1976 | US3944814 Light detecting apparatus of improved resolution |
| 02/03/1976 | US3936797 Radar-barometric altitude indicator |
| 02/03/1976 | US3936796 Aircraft ground proximity warning instrument |
| 02/03/1976 | US3936197 Self-leveling laser assembly |
| 01/20/1976 | US3934222 Terrain closure warning system with climb inhibit and altitude gain measurement |
| 01/20/1976 | US3934221 Terrain closure warning system with altitude rate signal conditioning |