manipulative or deceptive device or contrivance,
The term manipulative or deceptive device or contrivance, as used in section 10 (48 Stat. 891; 15 U.S.C. 78j(b)), is hereby defined to include any act or omission to act with respect to any security exempted from the operation of section 12(a) (48 Stat. 892; 15 U.S.C. 78l(a)) pursuant to any section in this part which specifically provides that this section shall be applicable to such security if such act or omission to act would have been unlawful under section 9(a) (48 Stat. 889; 15 U.S.C. 78i(a)), or any rule or regulation heretofore or hereafter prescribed thereunder, if done or omitted to be done with respect to a security registered on a national securities exchange, and the use of any means or instrumentality of interstate commerce or of the mails or of any facility of any national securities exchange to use or employ any such device or contrivance in connection with the purchase or sale of any such security is hereby prohibited.