| 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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| 09/28/1988 | CN87214867U Level survey pentagonal len of laser vertical instrument |
| 09/27/1988 | US4773161 Portable liquid level |
| 09/20/1988 | US4773017 Method and device for assisting height holding in air navigation |
| 09/20/1988 | CA1242255A1 Excessive pitch attitude warning system for rotary wing aircraft |
| 09/20/1988 | CA1242254A1 Warning system for aircraft landing with landing gear up |
| 09/14/1988 | EP0281924A2 Automatic compensator for compensating collimation error due to inclination in surveying instruments |
| 09/13/1988 | US4770480 Apparatus and method for providing multiple reference laser beams |
| 09/13/1988 | US4769918 Level indicating device |
| 09/08/1988 | DE3706363A1 Hydrostatic height measuring device |
| 09/06/1988 | US4769645 Excessive pitch attitude warning system for rotary wing aircraft |
| 09/01/1988 | DE3705835A1 Bicycle computer |
| 08/30/1988 | US4767208 Self leveling transmitter for laser alignment systems |
| 08/23/1988 | CA1241096A1 Ground proximity warning system geographic area determination |
| 08/23/1988 | CA1241082A1 Warning system for tactical aircraft |
| 08/23/1988 | CA1241081A1 Excessive terrain closure warning system |
| 08/16/1988 | CA1240771A1 Warning system for tactical rotary wing aircraft |
| 08/09/1988 | CA1240384A1 Ground proximity warning system having modified terrain closure rate warning on glide slope approach |
| 07/20/1988 | EP0274525A1 Ground proximity warning system terrain classification system |
| 07/12/1988 | US4756617 Laser alignment system with modulated field |
| 06/28/1988 | US4753117 Method for displaying information to a diver |
| 06/21/1988 | CA1238401A1 Control system for a continuous cell target readout in a laser measurement system |
| 06/21/1988 | CA1238398A1 Terrain advisory system |
| 06/08/1988 | EP0269655A1 Warning system for tactical aircraft |
| 06/01/1988 | EP0269026A2 Sensor-controlled levelling device |
| 05/19/1988 | DE3638122A1 Electronic altimeter |
| 05/18/1988 | EP0267346A1 Method of determining the altitude of an aircraft |
| 05/18/1988 | EP0267238A1 Passive radio altimeter |
| 05/18/1988 | CN87207560U Lift level instrument |
| 05/11/1988 | CN87211050U Construction site measurement instrument |
| 03/23/1988 | CN87210507U Arc shaped levelling instrument |
| 03/22/1988 | US4732471 Laser alignment system with modulated field |
| 03/22/1988 | EP0173720A4 Pressure sensing. |
| 03/22/1988 | CA1234417A1 System for alerting a pilot of a dangerous flight profile during low level maneuvering |
| 03/15/1988 | US4730920 Optoelectronic stadia |
| 03/08/1988 | US4729378 Apparatus for ascertaining the pressure in a plenum chamber |
| 03/03/1988 | DE3627557A1 Arrangement for measuring and determining the lateral height and position of a point with respect to a prescribed reference point |
| 03/02/1988 | EP0257702A2 Navigational apparatus and methods for displaying aircraft position with respect to a selected vertical flight path profile |
| 02/24/1988 | CN87104480A 无源无线电高度计 Passive radio altimeter |
| 01/28/1988 | WO1988000749A1 Ground proximity warning system terrain classification system |
| 01/28/1988 | WO1988000748A1 Ground proximity warning system for an excessive descent rate over undulating terrain |
| 01/12/1988 | US4718171 Levelling system with rotating laser beam |
| 01/05/1988 | US4717251 Elevation measurement in high order surveying |
| 12/31/1987 | CN87206562U Multifunctional architectural levelling instrument |
| 12/29/1987 | US4715714 Measuring device for determining relative position between two items |
| 12/23/1987 | CN86205242U Direction-indicating dividing disc for level instrument |
| 12/15/1987 | US4712915 Arrangement for holding an instrument in alignment with a moving reflector |
| 12/12/1987 | CN86209225U Level instrument |
| 12/05/1987 | CN86209729U Electronic digital display for altitude |
| 12/05/1987 | CN86207019U Electric sensor for the measurement of horizontality and verticality |
| 12/03/1987 | DE3711448A1 Precision levelling instrument |
| 11/12/1987 | DE3706638A1 Hydrostatic level |
| 10/22/1987 | WO1987006335A1 Passive radio altimeter |
| 10/13/1987 | US4699004 Pressure sensing |
| 10/08/1987 | WO1987006044A1 Warning system for tactical aircraft |
| 09/22/1987 | US4694694 Solid state accumulating altimeter |
| 09/08/1987 | US4691445 Horizontal evaluation datum scope |
| 09/08/1987 | US4691444 Surveyor's level with constant instrument height and method |
| 09/02/1987 | EP0233941A1 Ground proximity warning system for use with aircraft having degraded performance. |
| 08/25/1987 | US4688937 Methods of, and systems, for monitoring and/or controlling mobile cutting means |
| 08/18/1987 | US4686773 Structure leveling system |
| 08/04/1987 | US4684948 Ground proximity warning system having modified terrain closure rate warning on glide slope approach |
| 07/29/1987 | CN86204840U 多用测量镜头 Multi-shot measurement |
| 07/22/1987 | EP0229300A2 Levelling system |
| 07/22/1987 | CN86204129U Level ruler equipped with vernier reading |
| 07/21/1987 | US4681438 Automatic compensator for compensating collimation error due to two-directional inclination in surveying instruments |
| 07/14/1987 | US4679940 Control system for a continuous cell target readout in a laser measurement system |
| 07/14/1987 | US4679937 Self leveling transmitter for laser alignment systems |
| 07/06/1987 | EP0217852A4 Aircraft terrain closure warning system with descent rate based envelope modification. |
| 07/06/1987 | EP0215115A4 Aircraft terrain warning system with configuration modified warning and improved mode switching. |
| 07/06/1987 | EP0214272A4 Altitude loss after take-off warning system utilizing time and altitude. |
| 06/24/1987 | CN86202270U Zero type level ruler |
| 06/23/1987 | US4675823 Ground proximity warning system geographic area determination |
| 06/23/1987 | US4674870 Laser alignment system with modulated field |
| 06/23/1987 | CA1223315A1 Negative climb after take-off warning system |
| 06/10/1987 | EP0224804A1 Tonometer for determining the internal pressure of eyes |
| 05/27/1987 | EP0223043A2 Self leveling transmitter for laser alignment systems |
| 05/19/1987 | US4666299 Inclination measuring apparatus having a prism with associated liquid container |
| 04/29/1987 | EP0219767A2 Laser alignment system with modulated field |
| 04/15/1987 | EP0217852A1 Aircraft terrain closure warning system with descent rate based envelope modification. |
| 04/07/1987 | US4654977 Electronic level |
| 04/01/1987 | CN85107029A Positioning and message-transfering system employing satellites and stored topographic map |
| 03/25/1987 | EP0215115A1 Aircraft terrain warning system with configuration modified warning and improved mode switching. |
| 03/24/1987 | US4651433 Pressure sensitive leveling device |
| 03/18/1987 | EP0214953A2 Device for transferring height measurements |
| 03/18/1987 | EP0214272A1 Altitude loss after take-off warning system utilizing time and altitude. |
| 03/17/1987 | US4650324 Level Transit |
| 03/12/1987 | WO1987001356A1 Ground proximity warning system for use with aircraft having degraded performance |
| 02/24/1987 | US4646244 Terrain advisory system |
| 02/24/1987 | CA1218442A1 Position based ground proximity warning system for aircraft |
| 02/04/1987 | EP0210902A1 Auxiliary method and device for maintaining altitude in aerial navigation |
| 01/27/1987 | US4639730 Excessive terrain closure warning system |
| 01/22/1987 | EP0193579A4 Excessive descent rate warning system for tactical aircraft. |
| 01/20/1987 | EP0190345A4 Ground proximity warning system for use with aircraft having degraded performance. |
| 01/08/1987 | DE3618513A1 Precision levelling instrument |
| 12/16/1986 | US4629325 Leading mark indicator |
| 10/21/1986 | CA1213013A1 Excessive descent rate warning system for rotary wing aircraft |
| 09/24/1986 | EP0195636A2 Wristwatch with pressure sensor |
| 09/10/1986 | EP0193579A1 Excessive descent rate warning system for tactical aircraft |
| 08/28/1986 | WO1986005023A1 Aircraft terrain closure warning system with descent rate based envelope modification |
| 08/28/1986 | WO1986005022A1 Altitude loss after take-off warning system utilizing time and altitude |