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1978-01-10
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GB1222556A
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1971-02-17
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GB144733A
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GB244263A
(enrdf_load_stackoverflow )
US2548553A
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1951-04-10
Perpetual calendar
GB190409526A
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1905-02-23
Improvements in Perpetual Calendars
GB339571A
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1970-12-15
Adjustable calendar
GB570489A
(enrdf_load_stackoverflow )
GB609421A
(enrdf_load_stackoverflow )
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1930-12-09
William james sidis
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1906-05-03
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1905-10-26
Improved Perpetual Calendar
US1906908A
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1933-05-02
Watch or clock calendar or date indicator
RU9992U1
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1999-05-16
Многолетний календарь
GB698886A
(enrdf_load_stackoverflow )
GB620059A
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JPS634229Y2
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1988-02-02
GB189827378A
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1899-12-28
Adjustable Perpetual Calendar and Date Calculator.
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1895-02-26
Perpetual calendar
KR860000346Y1
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1986-03-17
만년 카렌더
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1921-09-16
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1909-05-27
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1925-02-17
Calendar
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1932-10-06
Improvements in or relating to calendars