12. Construction, installation or operation of electric light
and electric power lines, dynamos or appliances and power
transmission lines.

13. Paving, sewer and subway construction, work under
compressed air, excavation, tunneling and shaft sinking, well
digging, laying and repair of underground pipes, cables and
wires, not included in paragraph 5 of this section.

14. Lumbering, logging, river-driving, rafting, booming,
saw mills, shingle mills, lath mills, manufacture of veneer and
of excelsior, manufacture of staves, spokes or headings.

15. Pulp and paper mills.

16. Manufacture of furniture, interior woodwork, organs,
pianos, piano actions, canoes, small boats, coffins, wicker and
rattan ware, upholstering, manufacture of mattresses or bed
springs.

17. Planing mills, sash and door factories, manufacture of
wooden and corrugated paper boxes, cheese boxes, mouldings,
window and door screens, window shades, carpet sweepers,
wooden toys, articles and wares or baskets.

18. Mining, reduction of ores and smelting, preparation
of metals or minerals.

19. Quarries; sand, shale, clay or gravel pits, lime kilns;
manufacture of brick, tile) terra-cotta, fire-proofing, or paving
blocks) manufacture of calcium carbide, cement, asphalt or
paving material.

20. Manufacture of glass, glass products, glassware, porce-
lain or pottery.

21. Iron, steel or metal foundries; rolling mills; manu-
facture of castings, forgings, heavy engines, locomotives, ma-
chinery, safes, anchors, cables, rails, shafting, wires, tubing,
pipes, sheet metal, boilers, furnaces, stoves, structural steel,
iron or metal.

22. Operation and repair of stationary engines and boilers,
not included in other paragraphs of this section.

23. Manufacture of small castings or forgings, metal wares,
instruments, utensils and articles, hardware, nails, wire goods,
screens, bolts, metal beds, sanitary, water, gas or electric fix-
tures, light machines, typewriters, cash registers, adding ma-
chines, carriage mountings, bicycles, metal toys, tools, cutlery,
instruments, photographic cameras and supplies, sheet metal
products, buttons.