| 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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| 08/28/1986 | WO1986005021A1 Aircraft terrain warning system with configuration modified warning and improved mode switching |
| 08/28/1986 | WO1986004983A1 Configuration responsive descent rate warning system for aircraft |
| 08/13/1986 | EP0190345A1 Ground proximity warning system for use with aircraft having degraded performance. |
| 08/06/1986 | CN85202835U Surface falling-level meter for mine |
| 08/05/1986 | US4604737 Electronic diving apparatus |
| 08/05/1986 | US4603485 Leveling apparatus |
| 07/23/1986 | CN85202935U Automatic correcting plane meter |
| 06/25/1986 | EP0185363A2 Automatic compensator for compensating collimation error due to two-directional inclination in surveying instruments |
| 06/18/1986 | CN85203389U Vertically sliding reflector |
| 05/27/1986 | CA1205167A1 Ground proximity warning system with time and altitude based mode switching |
| 04/15/1986 | US4581931 Differential level-monitoring float device |
| 03/13/1986 | WO1986001622A1 Excessive descent rate warning system for tactical aircraft |
| 03/12/1986 | EP0173720A1 Pressure sensing |
| 02/13/1986 | WO1986001022A1 Ground proximity warning system for use with aircraft having degraded performance |
| 01/28/1986 | US4567483 Position based ground proximity warning system for aircraft |
| 01/14/1986 | US4563822 Level device for masonry work |
| 11/13/1985 | EP0161207A2 Liquid prism |
| 11/05/1985 | US4551723 Excessive descent rate warning system for rotary wing aircraft |
| 09/12/1985 | WO1985004012A1 Pressure sensing |
| 09/10/1985 | US4539843 Altimeter and vertical speed indicator |
| 08/27/1985 | US4536968 Adjustable water level device |
| 08/15/1985 | WO1985003566A1 Terrain advisory system |
| 06/04/1985 | US4520668 Manometric instrument for underwater diving |
| 05/15/1985 | EP0053606B1 An instrument for levelling and for laying-out right angles |
| 04/16/1985 | US4511247 Surveying technique with correction of optical errors caused by atmospheric turbulence |
| 04/02/1985 | US4507962 Digital barometric altimeter |
| 01/22/1985 | US4495483 Ground proximity warning system with time based mode switching |
| 01/22/1985 | US4494870 Arrangement for setting out points and straight lines |
| 01/22/1985 | US4494407 Depthometer for underwater diving |
| 01/22/1985 | CA1181521A1 Pressure sensor for determining airspeed, altitude and angle of attack |
| 01/08/1985 | US4492037 Liquid leveling device |
| 01/08/1985 | CA1180549A1 Level indicator |
| 01/02/1985 | EP0059741B1 Leading mark |
| 01/01/1985 | US4490919 Leveling arrangement for measuring terrain points |
| 12/18/1984 | CA1179495A1 Apparatus for measuring the visibility range in the fog |
| 12/11/1984 | US4488050 Level measuring instrument having a staff with light-emitting elements |
| 11/06/1984 | CA1177562A1 Ground proximity warning system with time based mode switching |
| 10/02/1984 | US4474430 Leading mark |
| 06/19/1984 | CA1169523A1 Method and apparatus for measuring the movement of a spiral wound wire rope |
| 06/05/1984 | US4453154 Altitude monitor |
| 06/05/1984 | US4452078 Device for checking the depth reached by a digging operation |
| 04/10/1984 | US4441818 Deflection unit |
| 03/06/1984 | US4434561 Level indicator |
| 02/21/1984 | US4433323 Ground proximity warning system with time and altitude based mode switching |
| 02/14/1984 | US4431994 Method for supplying altitude signals to an output bus |
| 01/18/1984 | EP0098321A1 Combined barometer-altimeter gauge |
| 12/27/1983 | US4422244 Elevation indicator |
| 11/15/1983 | CA1157132A1 Negative climb after take-off warning system with configuration warning means |
| 09/20/1983 | CA1154168A1 Processing element for parallel array processors |
| 09/13/1983 | US4403512 Servo-type capsule-equipped instrument |
| 08/30/1983 | US4400888 Instrument for levelling |
| 08/09/1983 | US4397099 Electronic apparatus for measuring the difference of elevation between two points |
| 07/19/1983 | CA1150049A1 Electro-optical distance-measuring system |
| 07/12/1983 | CA1149953A1 Laser altimeter and probe height sensor |
| 07/05/1983 | US4391290 Altitude sensing control apparatus for a gas turbine engine |
| 06/07/1983 | US4387360 Glidepath system for use with aircraft altimeters |
| 06/07/1983 | US4386851 Instrument for measuring or marking out distances from a line or a plane |
| 05/24/1983 | US4384410 Precision hydrostatic levelling system |
| 04/19/1983 | CA1145014A1 Diagnostics in ground proximity warning systems |
| 04/12/1983 | US4379367 Electrically controlled level |
| 04/05/1983 | US4378696 Pressure sensor for determining airspeed altitude and angle of attack |
| 03/31/1983 | WO1983001106A1 Leading mark indicator |
| 11/02/1982 | US4356726 Apparatus for detecting grade of vehicle from atmospheric pressure difference |
| 11/02/1982 | US4356639 Compact portable digital multimeter for instantaneous measuring of height differences independently of visibility |
| 10/19/1982 | US4355294 Altitude alert system |
| 10/05/1982 | CA1133098A1 Aircraft excessive descent rate warning system |
| 09/15/1982 | EP0059741A1 Leading mark. |
| 09/02/1982 | WO1982002944A1 Pressure sensor for determining airspeed,altitude and angle of attack |
| 08/31/1982 | US4346994 Secondary alignment target for an electro-optical alignment measuring system |
| 08/24/1982 | US4345382 Contractor's grade rod apparatus and procedure for setting and checking grades |
| 08/11/1982 | EP0057481A1 Differential level-monitoring float device |
| 06/16/1982 | EP0053606A1 An instrument for levelling and for laying-out right angles. |
| 06/08/1982 | US4333244 Leveling stand |
| 06/08/1982 | CA1125418A1 Terrain clearance warning system for aircraft |
| 04/01/1982 | WO1982001078A1 Leading mark |
| 03/16/1982 | US4319405 Leveling instrument |
| 03/09/1982 | US4319219 Automatic approach landing and go-around control system for aircraft |
| 03/09/1982 | US4319218 Negative climb after take-off warning system with configuration warning means |
| 02/02/1982 | US4314349 Processing element for parallel array processors |
| 01/05/1982 | CA1115512A1 Vertical and horizontal indicating level |
| 12/01/1981 | US4302973 Altitude difference measuring apparatus |
| 11/03/1981 | US4297791 Hose water leveling instrument |
| 11/03/1981 | CA1111953A1 Vehicle guidance system |
| 09/29/1981 | US4292671 Digital altimeter computer |
| 09/29/1981 | CA1109666A1 Electronic level |
| 09/15/1981 | CA1108847A1 Elevation measuring apparatus |
| 09/01/1981 | EP0027822A4 Laser altimeter and probe height sensor. |
| 08/06/1981 | WO1981002200A1 An instrument for levelling and for laying-out right angles |
| 05/06/1981 | EP0027822A1 Laser altimeter and probe height sensor |
| 04/08/1981 | EP0026723A1 Electric indicating level |
| 03/25/1981 | EP0025695A2 Instrument for measuring or marking out the distance of a point from a basic plane or line |
| 03/03/1981 | US4253335 Barometric altimeter |
| 03/03/1981 | CA1096607A1 Level indicating and elevation indicating device |
| 02/17/1981 | US4250746 Aircraft instrument |
| 01/07/1981 | EP0020603A1 Device for levelling-in |
| 11/26/1980 | EP0018975A1 Underwater levelling device |
| 11/25/1980 | CA1090164A1 Solid state barometric altimeter-encoder |
| 11/13/1980 | WO1980002455A1 Laser altimeter and probe height sensor |
| 11/04/1980 | US4231163 Level indicating and elevation indicating device |
| 09/23/1980 | US4224669 Minimum safe altitude monitoring, indication and warning system |