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Back to top 1.3. DESCRIPTIONS OF INDUSTRIES. MAJOR DIVISION 3: MANUFACTURING. 1. Manufacturing is defined as the physical or chemical transformation of materials or compounds into new products, whether the work is performed by power-driven machines or by hand, whether it is done in a factory or in the worker's home and whether the products are sold wholesale or retail.
Free Marble Appraisals and Identification. Please note that most of the information on this page is borrowed from the writings of Jeff Carskadden and Richard Gartley, both of whom have heavily researched this topic and are gratefully thanked for helping advance the hobby of marble collecting into the realm of professional archaeology.
There are many types of glass mirrors, each representing a different manufacturing process and reflection type. An aluminium glass mirror is made of a float glass manufactured using vacuum coating, i.e. aluminium powder is evaporated (or "sputtered") onto the exposed surface of the glass in a vacuum chamber and then coated with two or more layers of waterproof protective paint.
GLASS HAND MADE MARBLES. Hand made glass marbles were invented in Lauscha, Germany, in the late 1840s. They were produced until the early part of the twentieth century, when World War I and the invention of marble producing machinery in America effectively ended the hand made marble industry.