A proper value is applicable but not known. This event occurred, but the date is unknown (e.g., date of last contact is unknown).
a proper value is applicable but not known. this event occurred, but the date is unknown (e.g., date of last contact is unknown).
A proper value is applicable but not known. This event occurred, but the date is unknown (e.g., date of last contact is unknown).
a proper value is applicable but not known. this event occurred, but the date is unknown (e.g., date of last contact is unknown).