I've seen plenty of inventory tags on trees, copper discs inscribed with the tree inventory number which corresponds to the city records. The tags are attached with long nails partially sunk so there is an inch or two slack.
The problem is that the guys in the field running the saws rarely...
Well in that case I think it should become mandatory for all future concrete cavity fills to use steel reinforcing bars and make them stick out at least 6" past the bark. This will allow for future growth so they won't be buried unnoticed.
Rods and cable bolts should stick out far enough to be visible for decades. I can't imagine a tree being cabled and braced in such a way as to make the hardware invisible in less than 20 years.
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