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I have a feed - for example

2011 Patents of ultraviolet screens

If I run this next week, I would like to see if there had been an update since last time I looked - are there any feed readers that does this?

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Pretty much all feed readers do this, I'd recommend Google Reader. If you were looking for a way of automating the process (like if you want a shell script to check every week), please clarify and I'll try to provide an example.

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Yes please. You actually beat me to it. I used Firefox and it did not show any diff or "read" like Google reader does now I have tried it. –  mplungjan May 9 '11 at 11:58
    
Firefox also has some extensions could give you the features you want. –  user May 10 '11 at 4:25

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