GB633957A - - Google Patents

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Publication number
GB633957A
GB633957A GB633957DA GB633957A GB 633957 A GB633957 A GB 633957A GB 633957D A GB633957D A GB 633957DA GB 633957 A GB633957 A GB 633957A
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GB
United Kingdom
Prior art keywords
key
lever
depressed
keys
pivoted
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English (en)
Publication of GB633957A publication Critical patent/GB633957A/en
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