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https://thelightingcentre.co.nz/product-category/lighting-accessories/lampholders/
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https://www.iso80369testingequipment.com/product/index.php?stype=0&search=tag&content=gauge_for_testing_protection_against_bulbneck_damage_and_for_testing_contactmaking_in_lampholders_e27700622a5&lang=en&page=1
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https://s-lilley.co.uk/product/m20-1-5-bc-shade-ring-earthed-brass-lampholder/
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Dec 9, 2025 - M20 x 1.5mm pitch female threaded entry Max Height 45.6mm Max Diamter 32mm Certificate Here