(Richmond, IN)--There was a large response of firefighters to the Purina building on North 4^th in Richmond Tuesday morning.  But, that fire turned out to be relatively minor.  "They had some type of small fire in a grinder," said Battalion Chief Jerry Benjamin.  Firefighters were on the scene for about two hours to make sure it didn’t spread below the building’s upper floors.  All but one fire engine in the city responded.