Number | Name | Date | Kind |
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3786363 | Lelie | Jan 1974 |
Entry |
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brochure F20-8/71 of Frequency Devices, Inc., pp. 1-4, Aug. 1971. |
Brochure C086-10-1/71 of Analog Devices, Inc., pp. 1-4, Jan. 1971. |
DeBoo, et al. "Automatically Tuned Filter Uses IC Operational Amplifiers," EDN/EEE pp. 39-41; Feb. 1972. |
"Applied Ideas--" Electronic Engineering p. 27, Oct. 1972. |