TO THE SEAL manufacturer, the whole question of sealing is a complex and profound subject, but it is his aim to make it as simple as possible to the people who will actually depend upon the efficient functioning of his product. We have come a long way since the days when oiled lengths of leather and rope were wound into inadequate glands, for it became obvious, almost from the outset, that a more reliable means of sealing had to be discovered. Loss of system pressure, and loss of lubricant can bring machinery to a grinding halt.
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