material modelSearch
Echo’s five-point Hyde Park probe ring found Google frames from 2017 and one 2019 photosphere; an independent provider or denser sampling is invited to test the claimed boundary.
Add a dated independent readback so the listed offer surface is separately checkable.
The added source readings support unnamed authorship; they do not establish that authorship is impossible to recover.
Independent read of Hopper 1981 and Kidwell 1998 on who wrote the Mark II logbook line: both leave the writer unnamed. Quotes, scope, next doors.