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Whats is the full form of VKD, VDL, VKR in PVC Valves

Whats is the full form of VKD, VDL, VKR in PVC Valves.

Downunder35m4 months ago

Ask your teacher to provide with questions that have enough information for other people to answer them for you.
Otherwise feel free to provide these infos on top of the copy and paste job from your homework.
We are good but even we are too lazy to get out crystal balls out every day. ;)