Lee, Flanger #015 was the only one left in service in the 30's.
And as is so often the case with every photo telling a story....
Look carefully above the center of the flanger, the lever is up, meaning the blade is down. Looking at the blade, the blade is most definitely down. The 1940 side view of flanger #015, which I relied on heavily building my model, also shows the lever up, but the blade has been fixed in a way that the blade will not drop at or below rail height. I'd probably have had to build the model the way I did anyway, as I couldn't operate the blade lowered. Oh well, as they say, "That's show biz."
At least I have evidence the prototype was modified.....
More photos of the flanger can be found in a thread from last fall, search "Flanger 015". If you need one for Winter operations this year, you better get cracking....
And yes, "grondcover" continues in the Southern end of the yard.