All display of cellulose-nitrate plastic (pyroxylin) articles in stores shall be in showcases or show windows, except as permitted below:
A. Articles may be placed on tables but no table shall be over three feet wide and 10 feet long, and tables shall be spaced at least three feet apart. Where articles are displayed on counters, they shall be arranged in like manner.
B. Spaces underneath tables shall be kept free of storage of any kind and of accumulations of paper, refuse and other combustible material.
C. Sales or display tables shall be so located that, in the event of a fire at that table, the table will not interfere with free exit from the room in at least one direction.
D. No electric or gas light shall be located directly above any cellulose-nitrate plastic (pyroxylin) material, unless provided with a suitable guard to prevent heated particles falling.