Section 12. Section one hundred ninety-one of Commonwealth Act Numbered Four hundred sixty-six, as amended, is hereby further amended to read as follows:

"Sec. 191. Percentage tax on road, building, irrigation, artesian well, waterworks, and other construction work contractors; proprietors or operators of dockyards, and others. Road, building, irrigation, artesian well, waterworks, and other construction work contractors; filling contractors; demolition and salvage work contractors; arrastre contractors; persons engaged in the installation of gas or electric light, heat, or power; persons selling water, light, heat, or power, except those paying a franchise tax; proprietors or operators of dockyards, mine drilling apparatus, smelting plants, engraving plants, plating establishments, plastic lamination establishments, vulcanizing and recapping establishments; establishments for washing and/or greasing of motor vehicles, battery charging, planning or surfacing and recutting of lumber; sawmills under contract to saw and/or cut logs belonging to others; dry-cleaning or dyeing establishments, steam laundries, laundries using washing machines; photographic studios, telephone or telegraph lines or exchanges, broadcasting or wireless stations; funeral parlors; shops for the construction or repair of bicycles or vehicles of any kind, mechanical devices, instruments, apparatus, or furniture of any kind, shoe repairing by machine or any mechanical contrivance, and tailor shops, beauty parlors, dressmakers, milliners, hatters, keepers of hotels, lodging houses, stevedores, warehousemen; plumbers; smiths; house or sign painters; lithographers, publishers, except those engaged in the publication or printing and publication of any newspaper, magazine, review or bulletin which appears at regular intervals, with fixed prices for subscription and sale, and which is not devoted principally to the publication of advertisements; printers and bookbinders, business agents and other independent contractors, shall pay a tax equivalent to three per centum of their gross receipts.

"Keepers of restaurants, refreshment parlors and other eating places, and caterers, shall pay a tax of three per centum of their gross receipts. Keepers of bars and cafes where wines or liquors are served shall pay a tax of seven per centum of their gross receipts: Provided, however, That two sets of sales or commercial invoices or receipts serially numbered in duplicate shall be separately prepared and issued, one for each sale of food or refreshment served and another for each sale of wine or liquor served, the originals of which shall be issued to the purchaser or customer. Where such establishments are maintained within the premises or compound of a race track or jai-alai or are accessible to patrons of such race tracks or jai-alai by means of a connecting door or passage, the keepers of such establishments shall pay a tax of twenty per centum of their gross receipts. Where the establishment is maintained within the premises of a cabaret or night club, or is accessible to patrons thereof by means of a connecting door or passage, the keeper of the establishment shall pay a tax of ten per centum of the gross receipts."