Del. Code Ann. tit. 29, § 7411
Exemption from taxation
29 Del. C. 1953, § 7405; 54 Del. Laws, c. 124; 62 Del. Laws, c. 146, §§ 6, 17; 64 Del. Laws, c. 131, § 11(f);
Bonds, notes and revenue notes and the interest thereon shall be exempt from income taxation by the State or any political subdivision thereof.
29 Del. C. 1953, § 7405; 54 Del. Laws, c. 124; 62 Del. Laws, c. 146, §§ 6, 17; 64 Del. Laws, c. 131, § 11(f)