Film, Media & TV5 mins ago
Sunday Express
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12a A _ oscillator is one containing a tetrode in which the screen grid is more positive than the anode causing the anode current to decrease as its viltage increases (d-n--r-n)
25d A heavier-than-air machine such as an aircraft (-e--d--e)
25d A heavier-than-air machine such as an aircraft (-e--d--e)
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