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June 30, 2022 at 8:37 pm
#10508
David Boeschen
Participant
I haven’t figured exactly when either of these programs was begun. I think the first spark arrestors, the early style, started to appear around this time, and possibly only in areas where they were most needed, such as rural areas in the Midwest.
Cutting out the side skirts may have started earlier, maybe by mid-fifties. That work and the addition of MU connections to the front ends of F units may have happened at about the same time.
RG7
