For the contract of suretyship to be valid, the declaration of suretyship is to be issued in writing. The declaration of suretyship may not be made in electronic form. To the extent the surety discharges the main obligation, the defect of form is remedied.
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Book 2 · Law of obligations › Title 20 · Suretyship › Section 766
Written form of the declaration of suretyship
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