FOUNTAIN-PEN CALENDAR Russian patent published in 1996 - IPC

FIELD: displaying days of week. SUBSTANCE: fountain-pen calendar has body with small sliding ring free to move by means of pen in small slot through one line downward and upward, and with large sliding ring free to move by means of other pen in large slot through three lines upward and downward. Subtrahend numbers are marked on body to the left of small slot for sliding ring. Months from March through December and month factors are marked in central part of body. Small sliding ring bears months January and February and factors for these months. Large sliding ring bears line indices with month factors for normal years and leap-years. Cut is provided on left-hand end of body through which small sliding ring is displaced up and down by means of pen. Other cut is made on right-hand end of body for large sliding ring to move up and down by means of pen. EFFECT: improved design. 8 dwg