पेरिस्कोप
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thumb|periskop periskop (aangrezi:Periscope) ek vaijnanik upakaran hai. panadubbiyoan mean upayog hone vala aisa upakaran jisaki sahayata se pani mean doobe hue hi ko pani ke oopar ka drishy dekhaee p d sakata hai.
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sanbandhit lekh
varnamala kramanusar lekh khoj
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