§ 418. Assignment of mortgage, lease, or other lien or charge. The
holder of any mortgage, lease, or other lien or charge on registered
property, in order to transfer the same or any part thereof, shall
execute an assignment of the whole or any part thereof; and upon such
assignment being filed in the office of the registrar, the registrar
shall enter in the title book a memorial of such transfer with a
reference to the assignment by its file number; he shall also note upon
the instrument on file in his office intended to be transferred, and
upon the registration copy thereof produced, the number of the
certificate on which the memorial is entered, with the date of the
entry.