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3. Magnet - Wikipedia

   en.wikipedia.org/wiki/Magnet

   A magnet's magnetic moment (also called magnetic dipole moment and usually denoted μ) is a vector that characterizes the magnet's overall magnetic properties. For a bar magnet, the direction of the magnetic moment points from the magnet's south pole to its north pole, [ 15 ] and the magnitude relates to how strong and how far apart these poles ...

4. HP-67/97 - Wikipedia

   en.wikipedia.org/wiki/HP-67/97

   The built-in magnetic card reader/writer could be used to save programs and data, with the ability to combine data from multiple cards. The same magnetic card format was later used for the HP-41C which offered compatibility to the 67/97 through software in the card reader. HP offered a library of programs supplied on packs of pre-recorded ...

5. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

6. Forrest Parry - Wikipedia

   en.wikipedia.org/wiki/Forrest_Parry

   Forrest Corry Parry (July 4, 1921 – December 31, 2005) was an American IBM engineer who invented the magnetic stripe card used for credit cards and identification badges. [ 1 ] [ 2 ] Early life

7. Smart card - Wikipedia

   en.wikipedia.org/wiki/Smart_card

   Non-EMV cards work like magnetic stripe cards. This is common in the U.S. (PayPass Magstripe and Visa MSD). The cards do not hold or maintain the account balance. All payment passes without a PIN, usually in off-line mode. The security of such a transaction is no greater than with a magnetic stripe card transaction. [citation needed]