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Creation Date 

1. Before 1995  (27)
2. 1995 To 2001  (291)
3. 2002 To 2008  (870)
4. 2009 To 2016  (2,103)
5. After 2016  (6,021)
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New Records 

1. New From Last Month  (71)
2. New From Last 3 Month  (593)
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Subject 

1. Radio Direction-Finding  (5,128)
2. Analogous Arrangements Using Other Waves  (5,128)
3. Radio Navigation  (5,128)
4. Locating Or Presence-Detecting By Use Of The Reflection Orreradiation Of Radio Waves  (5,128)
5. Determining Distance Or Velocity By Use Of Radio Waves  (5,128)
6. Calculating  (3,715)
7. Computing  (3,715)
8. Counting  (3,715)
9. Surveying  (2,789)
10. Navigation  (2,789)
11. Measuring Distances, Levels Or Bearings  (2,789)
12. Gyroscopic Instruments  (2,789)
13. Photogrammetry Or Videogrammetry  (2,789)
14. Transmission Of Digital Information, E.G. Telegraphiccommunication  (2,113)
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Language 

1. English  (8,540)
2. Chinese  (2,229)
3. French  (1,854)
4. German  (1,222)
5. Korean  (426)
6. Japanese  (172)
7. Portuguese  (40)
8. Russian  (30)
9. Swedish  (21)
10. Finnish  (19)
11. Danish  (11)
12. Polish  (10)
13. Spanish  (10)
14. Norwegian  (3)
15. Lithuanian  (2)
16. Hungarian  (2)
17. Hebrew  (2)
18. Arabic  (1)
19. Croatian  (1)
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