Abstract: A unitary, demountable, insertable modular magnetic transducer transport assembly for use with accounting records such as magnetically encoded bank account passbooks, magnetic striped ledger sheets and credit cards including self contained magnetic transducer transport for timing track and data pick-up mechanisms capable of being operably coupled to and forming part of an automatic data print out apparatus for on line data processing of accounting information.

Abstract: A reader/writer credit card modular assembly wherein a T-shaped vertically disposed rail member provides accurate positioning of a credit card relative to a read/write transducer and to a timing track transducer through a reference plane established by means of horizontally disposed pins carried by the rail member. The credit card is vertically supported on the pins which in conjunction with a built-in tool or gauge member adjustable parallel to the card enables accurate preadjustment for a plurality of electromagnetic transducer heads arranged to be moved across the front surface of the credit card effective thereby to read from or write upon the credit card in synchronism with a prerecorded timing track disposed adjacent and parallel to the credit card.