Catalog, 1980, Green, No. 81, showing misc. products: Four double-sided 11.5″ x 8.75″ (280 x 217mm.) pages; No prices shown; Seventeen products shown; Technical data , including magnet strength, coil resistance, inductance is shown for the newer models only. This information is not shown for the four long-standing products shown on Page 4; DeArmond Inc. Airport Highway.
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