Means of teaching a foreign language

Claim 1

A TEACHING AID DEVICE FOR FACILITATING THE SELF-INSTRUCTION OF A FOREIGN LANGUAGE AND WHICH COMPRISES A PLURALITY OF SHEETS, A CIRCULAR BINDING MEANS CONNECTING THE PLURALITY OF SHEETS WHEREBY ONE PORTION OF THE SHEETS MAY BE ROTATED THROUGH THREE HUNDRED AND SIXTY DEGREES WITH RESPECT TO THE REMAINING PORTION OF THE SHEETS, EACH OF SAID SHEETS BEING PROVIDED WITH INFORMATION ON EACH SIDE THEREOF RELATING TO THE FOREIGN LANGUAGE AND A BASIC LANGUAGE CORRESPONDING THERETO, SAID INFORMATION BEING ARRANGED IN FACING SHEETS WITH ONE OF SAID FACING SHEETS BEING PROVIDED WITH A COLUMN OF BASIC WORDS AND A COLUMN OF CORRESPONDING FOREIGN WORDS WITH EACH BASIC WORD BEING ARRANGED IN SUBSTANTIAL ALIGNMENT WITH THE CORRESPONDING FOREIGN WORD, THE OTHER OF SAID FACING SHEETS BEING PROVIDED WITH A COLUMN OF BLANK SPACES, THE SUBSTANTIAL ALIGNMENT WITH A COLUMN OF BLANK SPACES, THE BASIC WORDS AND BLANKS ON THE SECOND MENTIONED FACING SHEET BEING IN SUBSTANTIAL ALIGNMENT WITH THE BASIC WORDS AND FOREIGN WORDS ON THE FIRST MENTIONED FACING SHEET, SAID CIRCULAR BINDING PROVIDING FOR POSITIONING OF EACH CORRESPONDING PAIR OF FACING SHEETS IN SUBSTANTIAL BACK TO BACK RELATIONSHIP FOR FACILITATING SELF-TESTING OF THE LEARNED WORDS, INDEPENDENT OPAQUE MASK MEANS SLIDABLY MOVABLE WITH RESPECT TO THE SHEETS, SAID MASK MEANS COMPRISING A SUBSTANTIALLY FLAT BODY PORTION HAVING AN OUTWARDLY EXTENDING TAB PROVIDED ON ONE EDGE THEREOF, SAID TAB BEING ARRANGED FOR OBSCURING THE WORDS OF ONE COLUMN AND PERMITTING VISUAL OBSERVATION OF THE ALIGNED WORD IN AN ADJACENT COLUMN, A PLURALITY OF RECORDING SHEETS SECURED TO THE MASK MEANS IN A MANNER PERMITTING A THREE HUNDRED AND SIXTY DEGREE ROTATION OF THE RECORDING SHEETS WHEREBY THE RECORDING SHEETS MAY BE DISPOSED ON EITHER OF THE OPPOSED FLAT SURFACES OF THE MASK MEANS.