Given the difficulties these companies are facing, some investors have begun to wonder if Exxon bought XTO last year to "mask the extent of their replacement problem, " said R.
Its replacement will face the same problem.
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To solve that problem, iFixit has commissioned replacement tabs and will include them with any iPad part it sells, says Wiens.
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The other problem is the lack of obvious replacement candidates for a fallen presidential choice.
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The Hearts goal-scorer was soon substituted with the striker limping with a muscle problem and Jamie Mole was introduced as a replacement.
The panel thinks the iWatch represents a massive opportunity for Apple and possibly a longer term replacement for the iPhone but battery life will be a problem to overcome.
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Reihana's absence left Northampton without a recognised goalkicker - he is unlikely to resume goalkicking against Biarritz because of a problem with his hamstring tendon - and his replacement, Carlos Spencer, has been frustratingly erratic.
He is battling a calf strain with his replacement against City, Jonny Evans, also carrying a hamstring problem.
Another problem is that farmers are deciding not to rear replacement cows for their herds, putting future milk supplies under threat.
That's a problem for Contacts, which sells almost half of its replacement lenses over the phone and the rest over the Internet or by mail order.
That's the other problem: If someone goes insolvent, like Villemont Geneve did in 2009, replacement parts and those qualified to service them could disappear.
The other problem for the new AOL-HuffPo is the rise of social networks as a replacement for search engines.
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The problem was no bells rang on Wall Street when the market value line approached the replacement value line on your chart.
Hodgson underwent surgery in August last year on a long-standing shoulder problem, but played in two of England's winter internationals in September - as a replacement in the victory over Australia, before being injured in the defeat by South Africa.
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