HP 54501A Programming Reference Manual page 4

List
of Effective Pages
The List of Effective
Pages gives the date
of
the current edition and of
any
pages changed in updates to that edition. Within
the manual, any page
changed since the last
edition is
indicated by printing the date the changes
were made on the bottom of
the page.
If
an update is
incorporated when
a
new edition
of
the manual
is
printed, the change
dates are removed from
the bottom of the pages and the new edition date is
listed
in the Printing
History
and on the title page.
Pages
Effective Date