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cogenric merger arm's length merger reverse merger hostile merger forward integration backward integration merger types friendly merger conglomerate merger horizontal merger merger vertical merger healthcare iot internet of things ic engine environmental inpact assesment eia internal combustion engine project charts & layouts structures & civil work project management environmental aspects machinery & equpiments rectifier voltmeter voltmeter digital voltmeter induction type voltmeter pmmc voltmeter dc voltmeter ac voltmeter vtvm fet-vtvm multi-range voltmeter moving iron voltmeter electro-dynamometer type voltmeter transformer diy led flasher arduino analog communication angle modulation ece frequency modulation phase modulation ptsd communication barrier noise figure classification of noise snr noise