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