| 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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| 04/28/1999 | CN2316631Y Height difference measuring deflection apparatus |
| 04/06/1999 | US5892462 Adaptive ground collision avoidance system |
| 04/01/1999 | DE19841815A1 Laser measuring instrument |
| 03/31/1999 | EP0904575A1 Method and system for aerodyne altitude management |
| 03/30/1999 | US5887354 Electronic level and leveling rod for use in electronic level |
| 03/16/1999 | US5884222 Collision avoidance device for aircraft, especially for avoiding collisions with the ground |
| 02/03/1999 | EP0895057A1 Optical axis tilt compensator |
| 02/03/1999 | CN1206846A Laser beam irradiation device |
| 02/02/1999 | US5867263 Laser survey instrument having a reflection light blocking means |
| 01/07/1999 | WO1999000644A1 Relative height gauge |
| 12/29/1998 | US5854988 Method for controlling an excavator |
| 12/16/1998 | EP0689109B1 Electronic appliance equipped with function of measurung water depth |
| 12/16/1998 | CN2300885Y Laser aligner |
| 12/16/1998 | CN2300884Y Laser aligner with positioning adjusting block |
| 12/09/1998 | EP0882948A1 Automatic angle compensator |
| 12/08/1998 | US5847824 Automatic angle compensator |
| 12/03/1998 | DE19723001A1 Method to detect kink, depression or air hole in hose carrying medium |
| 12/02/1998 | EP0881463A2 Laser light plane generator |
| 12/02/1998 | CN2299302Y Levelling instrument liquid automatic levelling device |
| 12/01/1998 | US5844150 Leap frogging hydrostatic altimeter with carry function |
| 11/17/1998 | US5839080 Terrain awareness system |
| 10/28/1998 | EP0874218A1 Surveying instrument |
| 10/21/1998 | CN1196497A Laser collimation device for automatic holding reference precision |
| 10/21/1998 | CN1040367C Laser rotative irradiation apparatus having reciprocating laser scanning system |
| 10/07/1998 | EP0868650A2 Ambiguous dial indicator with saturating setpoints |
| 10/01/1998 | WO1998043107A1 Satellite-based collision avoidance system and method therefor |
| 10/01/1998 | WO1998043045A1 Method for calibrating aircraft altitude sensors |
| 10/01/1998 | DE19709097A1 Flugführungssystem für tieffliegende Fluggeräte Flight management system for low-flying aircraft |
| 09/11/1998 | WO1998039620A1 Flight guidance system for low-flying aircraft |
| 09/11/1998 | WO1998039618A1 Educational clinometer apparatus |
| 09/01/1998 | US5801967 Method for determining the volume between previous and current site surfaces |
| 08/18/1998 | US5796517 Inner focus type telescope |
| 07/22/1998 | EP0854351A2 A laser survey instrument |
| 07/15/1998 | CN1039159C Object reflector detecting apparatus |
| 07/14/1998 | US5781126 Ground proximity warning system and methods for rotary wing aircraft |
| 07/07/1998 | US5777899 Horizontal position error correction mechanism for electronic level |
| 06/10/1998 | CN2283832Y Laser levelling instrument |
| 05/28/1998 | DE19648867A1 Building laser for installation work |
| 05/20/1998 | EP0842396A1 Ground proximity warning system |
| 05/19/1998 | US5753833 Electronic watch having a water depth measuring function |
| 05/12/1998 | US5751459 Marking apparatus having feedback-controlled rotational laser beam |
| 05/05/1998 | US5748353 Marking apparatus having feedback-controlled rotational laser beam |
| 04/28/1998 | US5745053 Landing gear warning apparatus and method for pilots approaching a runway with retracted landing gear |
| 04/22/1998 | CN2279585Y Laser sweep instrument |
| 04/14/1998 | US5739771 Ambiguous dial indicator with saturating setpoints |
| 03/12/1998 | WO1998010147A1 Construction machine with laser measuring instrument |
| 03/10/1998 | US5726365 Hydrostatic altimeter |
| 03/10/1998 | US5724744 Self-leveling device mounted on a rotating base for projecting laser rays |
| 03/04/1998 | EP0827055A1 Airspeed prediction filter |
| 03/04/1998 | EP0659265B1 Spatial positioning system |
| 03/04/1998 | CN2275709Y 磁阻尼补偿器 Magnetic damping compensator |
| 02/17/1998 | US5719581 Low-cost radio altimeter |
| 02/11/1998 | EP0823615A2 Light receiving point sensing device |
| 02/05/1998 | WO1998004929A1 Integrity monitoring method and apparatus for gps and dgps receivers |
| 02/05/1998 | WO1998004883A1 Aircraft terrain information system |
| 02/03/1998 | US5715101 Focusing apparatus for a surveying instrument |
| 01/29/1998 | DE19723654A1 Levelling staff for electronic levelling apparatus |
| 01/21/1998 | CN2273011Y Double compensation level conforming device |
| 12/30/1997 | US5703718 For detecting polarized light |
| 12/18/1997 | WO1997048029A1 Method and system for aerodyne altitude management |
| 12/10/1997 | EP0811728A1 Method for controlling an excavator |
| 12/02/1997 | US5693881 Ultrasonic sensor apparatus |
| 11/26/1997 | EP0809166A2 Spindle driven servomechanism |
| 11/26/1997 | EP0808447A1 Levelling instrument |
| 11/18/1997 | US5689251 Airspeed prediction filter |
| 11/04/1997 | US5684579 Automatic tilt angle compensator |
| 10/22/1997 | EP0802469A1 Device for aircraft ground collision avoidance with turn prediction |
| 10/08/1997 | EP0281576B1 Ground proximity warning system for an excessive descent rate over undulating terrain |
| 10/01/1997 | EP0797756A1 Level difference measurement apparatus |
| 09/24/1997 | EP0797075A2 Laser beam level sensor |
| 09/24/1997 | EP0797071A2 Automatic inclination correction for a laser beam surveying instrument |
| 09/24/1997 | EP0621942B1 Surveying system using radio ranging and barometric height |
| 09/23/1997 | US5671162 Device for recording descent data for skydiving |
| 09/09/1997 | US5666110 Warning system for providing a warning to a pilot |
| 09/02/1997 | US5663732 Integrity monitoring method and apparatus for GPS and DGPS receivers |
| 08/26/1997 | US5659966 Hydrostatic level measuring and survey apparatus |
| 08/21/1997 | WO1997024634A3 Ambiguous dial indicator with saturating setpoints |
| 08/20/1997 | EP0790484A2 Horizontal position error correction mechanism for electronic level |
| 08/20/1997 | EP0790355A1 Excavation region setting apparatus for controlling region limited excavation by construction machine |
| 08/20/1997 | EP0626561B1 Automatic inclination angle compensator |
| 08/14/1997 | WO1997029389A1 Terrain warning system |
| 08/14/1997 | WO1997029387A1 Low-cost radio altimeter |
| 08/13/1997 | CN1157020A Excavation regions setting apparatus for controlling region limited excavation by construction machine |
| 08/06/1997 | CN2258982Y Self-adjusting leveler |
| 07/30/1997 | EP0715707A4 Automatic level and plumb tool |
| 07/23/1997 | CN2258272Y Horizontal height difference positioning detector |
| 07/22/1997 | US5649600 Sensor mount for an excavator |
| 07/10/1997 | WO1997024634A2 Ambiguous dial indicator with saturating setpoints |
| 07/08/1997 | US5646857 Use of an altitude sensor to augment availability of GPS location fixes |
| 06/18/1997 | CN1152116A Horizontal position error correcting mechanism of electronic level gauge |
| 06/18/1997 | CN1152115A Altitude measuring device |
| 06/10/1997 | US5638059 Audible altimeter for parachutists |
| 05/22/1997 | WO1997018439A1 Hydrostatic height measurement system and method |
| 05/21/1997 | EP0774409A1 Method and apparatus for continuously determining the inclination and draft of waterborne floating vessel to enable automatic loading of the vessel |
| 05/13/1997 | US5629756 Laser beam projection apparatus |
| 04/15/1997 | US5619802 Automatic level and plumb tool |
| 04/08/1997 | US5617640 Level position measuring method, level marking method and level marking apparatus comprising a tube, capable of directly measuring a height |
| 03/01/1997 | CA2157127A1 Gravity level |
| 02/27/1997 | WO1997007296A1 Excavation region setting apparatus for controlling region limited excavation by construction machine |
| 02/13/1997 | WO1997005450A1 Ground proximity warning system |