Meetings and records. The presence of four members
of the Board shall be necessary for a quorum and the concurring vote
of a majority shall be necessary to effect any decision before the
Board. The Board shall keep minutes of its proceedings, showing the
vote of each member on every question, or if any member is absent
or fails to vote, indicating that fact, and shall also keep a record
of its examinations and other official actions. Every rule, determination,
regulation, amendment or appeal thereof, and every order, requirement
and decision of the Board shall immediately be filed in the office
of the Board.