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