50 FLEXIBLE WATER IMPERVIOUS PROTECTIVE COVERS OF THE THROW OVER TYPE FOR USE PRIMARILY IN OIL FIELDS-NAMELY, TARPAULINS, MOTOR COVERS, RADIATOR SHIELDS, PIECE OVER DRAW WORKS, WINDBREAKS FOR OIL DERRICK RACKING PLATFORMS, FLOOR WINDBREAKS, PUMP HOUSES, MUD HOUSES, AND ENGINE HOUSES AND SUCH