Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2462648A
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Individual
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Individual
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Priority to GB2462648ApriorityCriticalpatent/GB640871A/en
Publication of GB640871ApublicationCriticalpatent/GB640871A/en
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
G11B5/78—Tape carriers
Landscapes
Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves
(AREA)
Abstract
640,871. Sound records. KOLB, O. K., and PETERSEN, A. C. G. Sept. 20, 1948, No. 24626. Addition to 618,349. Drawings to Specification. [Class 40 (ii)] In a sound record of the kind described in the parent Specification, the visual signal indication record is produced by means of a dry chemical process in which a vibratory stylus is drawn over an oxide-coated surface to produce a transparent trace.
GB2462648A1948-09-201948-09-20Improvements relating to the recording of sound
ExpiredGB640871A
(en)