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Welcome, here we have one (1) military surplus circa 1969 New never used, mint condition Beckman Instruments Helipot. 3 gang multi turn lab quality potentiometer. This has continuous rotation with no stops. Starting from the back, 2K, 50k, 5k. Part number 5403-243-0. Body is approximately 1 3/4" in diameter and 2 1/4" deep with a 1/4" diameter shaft that is 3/4" long. These are hard to find parts, Made in USA.
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lilian_oconnor@oklahomaselltoday.com (Lilian Oconnor) for more information. All emails will be forwarded to the poster's actual email address.