Fountain pen for musical manuscripts

Claim 1

IN A FOUNTAIN PEN, A PEN STRUCTURE COMPRISING: A TUBULAR BODY HAVING AN UPPER PORTION FOR SUPPLY OF INK THERETO AND A LOWER END OPENING OF REDUCED DIAMETER; AN UPPER GUIDE BORE OF REDUCED INSIDE DIAMETER IN SAID BODY ADJACENT SAID UPPER PORTION; A LOWER GUIDE BORE OF REDUCED INSIDE DIAMETER IN SAID BODY ADJACENT SAID LOWER END OPENING; SAID BORES AND SAID LOWER END OPENING BEING AXIALLY SPACED-APART AND THEREBY FORMING, BETWEEN SAID UPPER GUIDE BORE AND SAID LOWER GUIDE BORE, A FIRST CHAMBER OF INCREASED INSIDE DIAMETER RELATIVE TO SAID BORES, AND BETWEEN SAID LOWER GUIDE BORE AND SAID LOWER END OPENING, A SECOND CHAMBER OF INCREASED INSIDE DIAMETER RELATIVE TO SAID BORES AND SAID OPENING; A STYLUS MEMBER IN SAID BODY EXTENDING BETWEEN AND AXIALLY SLIDABLE IN SAID BORES BETWEEN AN EXTENDED POSITION IN WHICH A LOWER END PORTION OF SAID STYLUS MEMBER PROTRUDES AXIALLY EXTERIORLY OF SAID LOWER END OPENING OF SAID BODY; AND A RETRACTED POSITION IN WHICH SAID LOWER END PORTION OF SAID STYLUS MEMBER IS RETRACTED WITHIN SAID LOWER END OPENING OF SAID BODY; RESILIENT BIAS MEANS CONSTANTLY URGING SAID STYLUS MEMBER TOWARD SAID EXTENDED POSITION;