{HEAD ~ The primary object} of the invention is to provide {TAIL ~ a rubber locking device} for a bicycle seat bag, which can allow detachment from the seat bag without utilizing any tool and obtain the purpose of convenient use 
is to provide
{ HEAD ~ The primary object } of the invention is to provide { TAIL ~ a rubber locking device } for a bicycle seat bag , which can allow detachment from the seat bag without utilizing any tool and obtain the purpose of convenient use
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