Variable: mh-thread-duplicates
mh-thread-duplicates is a buffer-local variable defined in
mh-thread.el.gz.
Documentation
Hash table used to associate messages with the same message identifier.
Source Code
;; Defined in /usr/src/emacs/lisp/mh-e/mh-thread.el.gz
(defvar-local mh-thread-duplicates nil
"Hash table used to associate messages with the same message identifier.")