Glass Insulators were first produced in the 1850's for use with telegraph lines. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. In the mid 1960's a few people began collecting these glass and porcelain insulators. Today there are over 2,000 collectors, and insulator clubs, national shows, and good reference books are available.
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for all GL 45 screw threads made of proven PP material temperature resistant up to +140°C after unscrewing the cap or severing the perforation the screw cap also can be used as a “common” screw cap Unmistakable: The coloured screw caps for all GL 45 screw threads made of proven PP-material temperature-resistant up to +140°C
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Sep 19, 2018 · If GL is the "German Bottle Closure Thread Series", I find the following for GL 45 in "Guide to World Screw Threads". As Gordon said, without tolerances you don't have too much to go on. Pitch = 4 Basic Dimensions: Neck Major = 45.00 Minor = 42.28 Cap Major = 45.30 Minor = 42.58 Depth of Thread = 1.36 Radius at Crest = 1.10 Radius at Root = 0.80
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Lab Use Gl25 Gl32 Gl45 Plastic Polypropylene Pp Thread Screw Cap For Bottle , Find Complete Details about Lab Use Gl25 Gl32 Gl45 Plastic Polypropylene Pp Thread Screw Cap For Bottle,Pp Screw Cap,Polypropylene Screw Cap,Thread Cap Gl45 from Lids, Bottle Caps, Closures Supplier or Manufacturer-Ningbo Ja-Hely Technology Co., Ltd.
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