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2. Postcard - Wikipedia

   en.wikipedia.org/wiki/Postcard

   A postcard or post card is a piece of thick paper or thin cardboard, typically rectangular, intended for writing and mailing without an envelope. Non-rectangular ...

3. Magnetic hysteresis - Wikipedia

   en.wikipedia.org/wiki/Magnetic_hysteresis

   Magnetic hysteresis can be characterized in various ways. In general, the magnetic material is placed in a varying applied H field, as induced by an electromagnet, and the resulting magnetic flux density (B field) is measured, generally by the inductive electromotive force introduced on a pickup coil nearby the sample.

4. Keycard lock - Wikipedia

   en.wikipedia.org/wiki/Keycard_lock

   Keycard systems operate by physically moving detainers in the locking mechanism with the insertion of the card, by shining LEDs through a pattern of holes in the card and detecting the result, by swiping or inserting a magnetic stripe card, or in the case of RFID or NFC cards, merely being brought into close proximity to a sensor.

5. Fatigue (material) - Wikipedia

   en.wikipedia.org/wiki/Fatigue_(material)

   A load-controlled servo-hydraulic test rig is commonly used in these tests, with frequencies of around 20–50 Hz. Other sorts of machines—like resonant magnetic machines—can also be used, to achieve frequencies up to 250 Hz.

6. Visa Inc. - Wikipedia

   en.wikipedia.org/wiki/Visa_Inc.

   Visa Inc. (/ ˈ v iː z ə, ˈ v iː s ə /) is an American multinational payment card services corporation headquartered in San Francisco, California. [1] [4] It facilitates electronic funds transfers throughout the world, most commonly through Visa-branded credit cards, debit cards and prepaid cards.

7. Maestro (debit card) - Wikipedia

   en.wikipedia.org/wiki/Maestro_(debit_card)

   The Laser debit card has been phased out by all banks and ceased to operate from March 2014. Irish Laser cards carried Maestro co-branding from 2008 onwards. They were intended to be used with chip and PIN POS systems. The chip on the card was programmed with two applications, one for Laser and one for Maestro.