Need sed script to remove characters

I need a sed script that will remove everything after and including the open paranthesis character "(".

For example, if I have a string like this:

I need it to be:

Any help would be appreciated.
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sed 's/\(.*\)(.*/\1/' filename

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sed "s/(.*//" filename

If you want to change the file at the same time, try using option -i
Kamaraj SubramanianApplication Support AnalystCommented:
$ sed 's/\(.*\)(.*/\1/' test1

#some other ways

$ nawk -F\( '{print $1}' inputfile
$ cut -d"(" -f1 inputfile

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Kamaraj SubramanianApplication Support AnalystCommented:
$ echo "Inventory_Listing(Br-01)" |perl -lane '$_=~s/\(.*//; print $_'                                                            

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