Synchronous and Other Multiple Telegraphs Some Methods of Obtaining Independent Telegraph Circuits on a Single Wire Both With And Without Synchonism

Items can be returned within 30 days of the estimated delivery date. All returns must be approved before an item is shipped back. Domestic returns generally take two weeks and International returns can take up to six weeks to be received and processed. In the event that an item is being returned due to an error on our part, a prepaid return label will be supplied via email upon request. If a return is not approved, there may be a delay with processing a refund.

Orders ship within 1 business day [M-F]. Items shipped via USPS Media Mail should arrive within 4-14 business days [M-F]. Please note, as per USPS, depending on service location and/or high peak periods within the post office, deliveries can take up to 21 business days [M-F] to arrive. Should your order not arrive within 21 business days [M-F], please contact us promptly for resolution.