weather-proof and boil-proof adhesive - vertaling naar russisch
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weather-proof and boil-proof adhesive - vertaling naar russisch

SPECIAL EARLY SAMPLES OF A COIN ISSUE
Proof coin; Proof (coin); Proof set; Proof penny; Proof coins; Proof pieces
  • 1970 British proof set
  • A 1969 [[United States Mint]] Proof set of 5 coins including 40% silver [[Kennedy half dollar]]
  • Decorative packaging for proof set: Reserve Bank of New Zealand; Royal Mint
  • Libertad]] coin of Mexico

weather-proof and boil-proof adhesive      

строительное дело

клей атмосферостойкий, стойкий к горячей и холодной воде, сухому теплу и микроорганизмам

weather-proof and boil-proof adhesive      
клей атмосферостойкий, стойкий к горячей и холодной воде, сухому теплу и микроорганизмам
mathematical proof         
RIGOROUS DEMONSTRATION THAT A MATHEMATICAL STATEMENT FOLLOWS FROM ITS PREMISES
TheoremProving; Proof (mathematics); Proof (math); Mathematical Proof; Proving (math); Maths proofs; Mathematical proofs; Proof techniques; Proof Techniques; Demonstration (proof); Derivation (mathematical logic); Methods of proof; Proof method; Skipped step; Essential step; Theorem-proving; Two-column proof; Mathing; Types of proof; Math proof; History of mathematical proof; Mathematical derivation; Geometric proof; Geometrical proof

математика

математическое доказательство

Definitie

прототип
муж., ·*греч. первообраз, начальный, основной образец, истинник. Прототипный, -типический, первообразный, первообразцовый.

Wikipedia

Proof coinage

Proof coinage refers to special early samples of a coin issue, historically made for checking the dies (as in demonstrating that something is true) and for archival purposes. Nowadays proofs are often struck in greater numbers specially for coin collectors (numismatists). Nearly all countries have issued proof coinage.

Preparation of a proof striking usually involved polishing of the dies. They can usually be distinguished from normal circulation coins by their sharper rims and design, as well as much smoother "fields" – the blank areas not part of the coin's design.

The dies for making modern proof coins are often treated with chemicals to make certain parts of the design take on a frosted appearance, with the polished fields taking on a mirror finish. Several other methods have been used in the past to achieve this effect, including sand blasting the dies, and matte proofs. Proof coins of the early 19th century even appear to be scratched, but it was part of the production process. The term "proof" refers to the process by which the coins are made and not to the condition of the coin. Certification agencies can grade and assign numerical ratings for proof coins. A PR70 coin is the highest grade possible for a proof coin and indicates a perfect example, with PR69 and lower grades reflecting some deficiency in the strike, centering, details, or other aspect of the coin.

Most proof coins are double struck under higher pressure. This does not normally result in doubling that is readily observable, but does result in the devices being struck fully, resulting in intricate elements of the original die being present on the proof that may not be present in such detail on circulation strikes. After being struck, they are separately and individually handled, in contrast to normal coins which are thrown into bins.

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