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MainCore 15m long White BT Telephone Extension Cable Lead For Office & Home 6 Wire (631a) BT Male to BT Female (Available in 2m, 3m, 5m, 10m, 15m, 20m) (15m): Amazon.co.uk: Electronics
BT Telephone Extension Cable 5M, Ancable White BT Male to Female Extension Cable 6-Pin Straight
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20m BT Telephone Extension Cable MALE TO FEM UK Lead Phone Fax Modem 4 pin4 wire | eBay