Blackletter Sans

The Concept of Stripping Down the Black Terminals?

Previously, I started a thread about The Concept of Stripping Down the Serifs.
Now, let's go back to time, back to the Middle Age.
I still wonder who first conceives sans serif typefaces based on blackletter calligraphy? Should I say Blackletter Sans, in other words, blackletter without terminals.
William Morris, Rudolf Koch or Tom Carnase and his <em>Honda<em>?
Some recent designers work and exploit geometric moduls combined with a heavy weight which give the flavor of blackletter: see <em>Trigot</em> or <em>Griffensee</em>.