It's the standard oil used by the military for Gas Turbine Engines typically found in aircraft.
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.mil stands for military. It Is The Highly trusted domain.
The prf means the coin is a proof, proof coins are not intended for circulation and have mirror like fields (spaces where there is no design) and generally frosty designs. US coins are graded on a scale from 1-70 with 1 being barely readable and 70 being absolute perfection. Prf 65 is a fairly low grade for a US proof made recently. For older coins Prf 65-66 are typical due to damage from improper storage. But for newer proofs, prf 68 is low and 69 and 70s are common.
1. PRF is based on population data as a whole, SRF is based on Sample data 2. We can draw only one PRF line from a given population. But we can Draw one SRF for one sample from that population. 3. PRF may exist only in our conception and imagination. 4. PRF curve or line is the locus of the conditional mean/ expectation of the independent variable Y for the fixed variable X in a sample data. SRF shows the estimated relation between dependent variable Y and explanatory variable X in a sample.
1 mil = 0.0254 millimeters4 mil = 0.1016 millimeters
1,570,000 Unless you are using mil to mean "millimetre" then 1.57 mil = 1.57 mm = 0.00157 m Or you are using mil to mean "millilitre" then 1.57 mil = 1.57 ml = 0.00157 l. Or you are using mil to mean "thousandths of an inch" then 1.57 mil = 0.00157 inch.