ProclamationNational
Proclamation No. 840, s. 1971 - Signed on April 19, 1971: Declaring the period from May 30 to June 6, 1971, as "Chemical Engineering Week".
Signed on April 19, 1971: Declaring the period from May 30 to June 6, 1971, as "Chemical Engineering Week".
April 19, 1971
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Proclamation No. 840, s. 1971 - Signed on April 19, 1971: Declaring the period from May 30 to June 6, 1971, as "Chemical Engineering Week".. BatasPH. Approved April 19, 1971. https://batasph.thirdygayares.com/proclamations/proclamation-no-840-s-1971