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Holter Labs, LLC Phone: 1.888.821.4667 Fax: 1.888.821.4677 ----------------------- Mailing Address: Po Box 2639 Laguna Hills, CA 92654 ----------------------- Hours of Operation: Front Office: Monday - Thursday: 7am - 5pm pst Friday: 7am - 12pm pst Lab Hours: (Cardiac Transmissions) Everyday - 24hrs