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2. Coupon (PWB) - Wikipedia

   en.wikipedia.org/wiki/Coupon_(PWB)

   A coupon or test coupon is a printed circuit board (PCB) used to test the quality of a printed wiring board (PWB) fabrication process. Test coupons are fabricated on the same panel as the PWBs, typically at the edges. Coupons are then inspected to ensure proper layer alignment, electrical connectivity, and cross sectioned to inspect internal ...

3. Zero-coupon bond - Wikipedia

   en.wikipedia.org/wiki/Zero-coupon_bond

   Zero coupon bonds have a duration equal to the bond's time to maturity, which makes them sensitive to any changes in the interest rates. Investment banks or dealers may separate coupons from the principal of coupon bonds, which is known as the residue, so that different investors may receive the principal and each of the coupon payments.

4. Rayon - Wikipedia

   en.wikipedia.org/wiki/Rayon

   The cuprammonium process (not in use today), using ammoniacal solutions of copper salts [6] The viscose process, the most common today, [ 7 ] [ 8 ] using alkali and carbon disulfide The Lyocell process, using amine oxide , which avoids producing neurotoxic carbon disulfide but is more expensive [ 9 ] [ 10 ]

5. Rothschild family - Wikipedia

   en.wikipedia.org/wiki/Rothschild_family

   The Rothschild family (/ ˈ r ɒ θ (s) tʃ aɪ l d / ROTH(S)-chylde German: [ˈʁoːt.ʃɪlt]) is a wealthy Ashkenazi Jewish noble banking family originally from Frankfurt.The family's documented history starts in 16th century Frankfurt; its name is derived from the family house, Rothschild, built by Isaak Elchanan Bacharach in Frankfurt in 1567.

6. Tsar Bomba - Wikipedia

   en.wikipedia.org/wiki/Tsar_Bomba

   ' Tsar bomb '; code name: Ivan [5] or Vanya), also known by the alphanumerical designation "AN602", was a thermonuclear aerial bomb, and the most powerful nuclear weapon ever created and tested. [ 6 ] [ 7 ] The Soviet physicist Andrei Sakharov oversaw the project at Arzamas-16 , while the main work of design was by Sakharov, Viktor Adamsky ...

7. Today sponge - Wikipedia

   en.wikipedia.org/wiki/Today_sponge

   The Today sponge is a brand of plastic contraceptive sponge saturated with a spermicide nonoxynol-9 to prevent conception. [1] While initially popular in the 1980s in the United States, it is no longer commercially available as of 2019.