An insurer may invest in equipment trust obligations or certificates adequately secured and evidencing an interest in transportation equipment used wholly or in part within the United States of America or Canada, which obligations or certificates carry the right to receive determined portions of rental, purchase or other fixed obligatory payments to be made for the use or purchase of such transportation equipment.

18 Del. C. 1953, § ?1316; 56 Del. Laws, c. 380, § ?1; 59 Del. Laws, c. 79, § ?17;