Refine My Results

Creation Date 

1. Before 1800  (9)
2. 1800 To 2012  (8)
3. 2013 To 2016  (156)
4. 2017 To 2021  (371)
5. After 2021  (348)
6. More options 

New Records 

1. New From Last Month  (74)
2. More options 

Resource Type 

1. Patents  (875)
2. Web Resources  (14)
3. Images  (2)
4. Archival Material / Manuscripts  (1)
5. Articles  (1)
6. More options 

Subject 

1. Physics  (278)
2. Measuring  (173)
3. Testing  (173)
4. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (122)
5. Optics  (97)
6. Optical Elements, Systems, Or Apparatus  (96)
7. Electricity  (82)
8. Basic Electric Elements  (63)
9. Semiconductor Devices  (45)
10. Electric Solid State Devices Not Otherwise Provided For  (45)
11. Calculating  (39)
12. Computing  (39)
13. Counting  (39)
14. Radio Direction-Finding  (37)
15. Analogous Arrangements Using Other Waves  (37)
16. Radio Navigation  (37)
17. Locating Or Presence-Detecting By Use Of The Reflection Orreradiation Of Radio Waves  (37)
18. Determining Distance Or Velocity By Use Of Radio Waves  (37)
19. Measuring Areas  (33)
20. Measuring Angles  (33)
21. More options 

Databases 

1. esp@cenet  (875)
2. Europeana Collections  (15)
3. Cambridge University Library IR - DSpace@Cambridge  (1)
4. Münchener DigitalisierungsZentrum (MDZ)  (1)
5. ProQuest Central  (1)
6. More options 

Language 

1. English  (883)
2. Danish  (2)
3. French  (1)
4. Armenian  (1)
5. More options