Catalog 1981 (# 81), black & yellow

This catalog has four pages, shows 13 products and measures 11.5″ x 8.5″ (280 x 217 mm.).  The  address is shown as 1702 Airport Highway.  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.