A "corner blade" is a blade (which can be a disc but usually isn't) for use in corners and other areas where you don't have a lot of space to work. For "diamond chain slot" it's not "diamond" + "chain slot", it's "diamond chain" + "slot". In other words, it's a slot (kerf) that that you pre-cut (make a narrow cut) with the corner blade and then this allows you to insert and use the "diamond chain" blade to finish the job. A "diamond chain" is a chainsaw blade that uses the MBS (industrial) diamonds as its cutting element. So, they cut a small slot with the corner blade and then use the MBS blade. HTH.

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Note added at 2005-02-09 14:27:47 (GMT)
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\"Diamond chain slot\" means \" a slot where the diamond chain blade can be used effectively\" and this is created by using the smaller corner blade first. HTH.

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Note added at 2005-02-10 06:32:58 (GMT) Post-grading
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I always try to be very clear, very thorough and give you lots of options/alternatives because I know from experience that most of the stuff that you translate is detailed, technical and demanding. Buona fortuna :)