PJ,Thank you for that interesting idea. It sounds as a very possible scenario.
Igor P.J. Alling Thu, 23 Jul 2015 08:14:48 -0700 wrote:I think the use of PL by some manufactures goes way back, there was once a standardized filter nominclature, that used letters, A for red, K[#] for Yellows, G for Deep Yellow.
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