Chemical Engineering Basics
Oxygen cylinders used for autogenous (cutting/welding) purposes are

Seamless & made of steel
Welded steel cylinders
Heat treated before use
Made by sand casting

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Chemical Engineering Basics
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

Disposing off a machine/property on as is where is basis
Disposing off machine/property, which is no longer useful in the present scenerio
Writing off the obsolete machine/ property
Mortgaging the obsolete machine/property

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