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Antique Hoyt Electrical Instrument Works DC Volt-Ammeter 1920 Penacook N.H. | #517023915
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HOYT ELECTRICAL INSTRUMENTS HST-90U-ULL-5AAC-600AAC / HST90UULL5AAC600AAC (BRAND | eBay
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Hoyt Electrical Instrument Works Distributor in Canada – Electro-Meters
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