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Title: Circular slide rule, cardboard, for acoustical calculations: [Go to resource]
Description: Circular slide rule, cardboard, for acoustical calculations: Masco "Sound Surveyor" made 1949 by Perrygraf, Illinois for Mark Simpson Manufacturing Company, New York License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: circular slide rule (acoustics) Temporal: 1949 Source: Science Museum Creator: Perrygraf Corporation Identifier: 1985-277 Go to resource More Like this...
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