Negatory. Until I see a swing down not in center, I'm sticking with my story. Maybe the L. does not mean left? I see designations "R.H." in places. Some of these old documents had several different draftsman (PC: Drafter) who just pulled any old abbreviation out of their assume. The FAM is famous for that.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn