It can be used conveniently as a back up power supply or {HEAD ~ emergency power supply} for {TAIL ~ VTR}, communication devices, portable electronic calculators, watches, computers and office automation devices and also as solar cells and cells for solar systems 
for
It can be used conveniently as a back up power supply or { HEAD ~ emergency power supply } for { TAIL ~ VTR } , communication devices , portable electronic calculators , watches , computers and office automation devices and also as solar cells and cells for solar systems
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