How was helken benefitted by mr grahambell accimpnied her to warld fair
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she came to about the earth's marvel inventions
she came to know about industries and working of its machinery
she saw the model of ship
she learnt the process of mining diamond . By touching the machines she learnt how diamonds are weighed, cut and polished
she examined about telephones, autophones , phonographs and other inventions
she learnt about progress of man
she proved her vocabulary
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