"SEC. 202. Articles not subject to percentage tax on sales.—The following shall be exempt from the percentage taxes imposed in Sections 194, 195, 196, 197, 198, 199, and 201:
"(a) Articles subject to tax under Title IV of this Code.
"(b) Articles subject to tax under Section 203 of this Code.
"(c) .22 caliber firearms and cartridges as well as other forms of ammunitions sold or delivered directly to the Armed Forces of the Philippines or any government instrumentality or agency engaged in maintaining peace and order for their use or issue.
"(d) Articles shipped or exported by the manufacturer or producer, irrespective of any shipping arrangement that may be agreed upon which may influence or determine the transfer of ownership of the articles so exported.
"(e) Articles sold by 'registered export producers' to (1) other 'registered export producers' (2) 'registered export traders' or (3) foreign tourists or travelers, which are considered as 'export sales'.
"Any percentage or specific tax paid under this Title or Title IV, respectively, on domestically manufactured or on imported raw materials used in the manufacture of finished products exported shall be allowed to be credited against other tax liabilities of the manufacturer-exporter: Provided, however, That the amount of the tax on the raw material, part, accessory, or other article shall be indicated as separate item in the sales invoice.
"Sales to foreign tourists paid for in acceptable foreign currency directly made by manufacturers or producers shall be considered export sales if the articles purchased are actually brought out of the Philippines by the buyers upon their departure."