(a) All proceedings, acts and things undertaken or done prior to July 7, 1943, in or for the authorization, issuance, execution, and delivery of notes and bonds by housing authorities for the purpose of financing or aiding in the development or construction of a housing project or projects, and all notes and bonds issued by housing authorities prior to July 7, 1943, are hereby validated and declared legal in all respects.
(b) All proceedings, acts and things undertaken, performed or done prior to September 9, 1955, in or for the authorization, issuance, sale, execution, and delivery of notes and bonds by housing authorities for the purpose of financing or aiding in the undertaking of a housing or redevelopment project or projects, and all notes and bonds issued by housing authorities prior to September 9, 1955, are hereby validated, ratified, confirmed, approved, and declared legal in all respects, notwithstanding any defect or irregularity therein or any want of statutory authority.