Answer:

DITTOS

Answer	Crossword Clue
DITTOS	" " "
DITTOS	Signs of repetition
DITTOS	Repetition signs

DITTOS	"Same as above" markings
DITTOS	Duplicates
DITTOS	Copies
DITTOS	Agrees with
DITTOS	Time-saving marks
DITTOS	Duplication marks
DITTOS	Says "I second that"
DITTOS	Plays copycat

DITTOS	Photocopy ancestors
DITTOS	Dupes
DITTOS	Things mentioned above.
DITTOS	Repeat marks.
DITTOS	Repetition savers
DITTOS	Marks of lazy listers
DITTOS	" " " " "
DITTOS	Old-fashioned paper copies

DITTOS	Secretaries used to make them
DITTOS	Photocopies, back in the day
DITTOS	Quaint paper copies
DITTOS	Marks for lazy listers
DITTOS	Lazy list marks
DITTOS	Copies of old
DITTOS	Old copies