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GB672662A
|
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Image projection optical system
|
|
GB672661A
|
|
Image projection optical system
|
|
GB631869A
|
|
Improvements in and relating to counting, or frequency divider, circuits
|
|
GB620585A
|
|
Improvements in and relating to selection arrangements for electrical pulse systems
|
|
GB646776A
|
|
Radio detection and ranging apparatus
|
|
GB606019A
|
|
Improvements in or relating to radio detecting and ranging devices
|
|
CA463051A
|
|
Alarm system for electric refrigerators
|
|
CA456431A
|
|
Frequency modulation detector circuit
|
|
CA462530A
|
|
Signalling system
|
|
CA450314A
|
|
Refrigerating apparatus
|
|
CA463049A
|
|
Alarm system for electric refrigerators
|
|
CA451500A
|
|
Refrigerator
|
|
CA463441A
|
|
Electron tube
|
|
CA462098A
|
|
Device for measuring high frequency power
|
|
CA463050A
|
|
Electric refrigerator alarm system
|
|
CA463704A
|
|
Resonant cavity oscillator
|
|
CA450145A
|
|
Humidity control
|
|
CA452885A
|
|
Humidity control apparatus
|
|
CA453521A
|
|
Electrical apparatus
|
|
CA459857A
|
|
Method and means for measuring power out-put of high frequency signal generators
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