Thanks for the help, Mike and LewiiG.
I'm sorry to say this, but I really don't know what Mike says.
How do the following sentences differ in meaning, Mike?
(a) There is an old table used for many years.
(b) There is an old table that has been used for many years.
(c) There is an old table that was used for many years.
Can (a) mean either (b) or (c)?