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Patent number is always a good start. 317715 was issued in 1928, so they can’t be any earlier than that.
Andy King
Senior Curator – Industrial & Maritime History and Working Exhibits
Bristol Culture
M Shed Museum
Princes Wharf
Wapping Road
Bristol
BS1 4RN
0117 903 1569
From: Social
History Curators Group email list [mailto:[log in to unmask]] On Behalf Of
Eleanor Root
Sent: 09 January 2018 14:10
To: [log in to unmask]
Subject: Plugs
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Hello everyone,
I was wondering if someone could point me in the right direction for how to date these plugs?
Thanks,
Eleanor
Eleanor Root
Collections and Learning Curator
Colchester and Ipswich Museum Service
01473 433570
Ipswich – A Fairtrade town
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