CT Scanners. Usually this instrument is used in the medical field, but it is also used in paleontology. In paleontology these are used to identify the reptiles and animals that are found in rocks without actually cracking the rocks.
4. You do not file a return: Keep records indefinitely. 5. You file a claim for credit or refund after you file your return: Keep records for three years from the date you filed your original return or two years from the date you paid the tax, whichever is later. 6. You file a claim for a loss from worthless securities or bad debt deduction: Keep records for seven years. 7.
1 Some make you keep tax records a really long time: In Ohio, itâs 10 years.  The IRS can also ask for records up to six years after a filing if they suspect someone failed to report 25% or more of his gross income. And the agency never closes the door on an audit if it suspects fraud.