Hello
Would someone please tell me again what the H stands for on the rear face of a cylinder? I know that I knew this once, but I just can't remember and I can't find a reference to it.
Thanks in advance.
JP
Would someone please tell me again what the H stands for on the rear face of a cylinder? I know that I knew this once, but I just can't remember and I can't find a reference to it.
Thanks in advance.
JP