SPIRO T. AGNEW, Governor                        137

clude all types of cranes, such as cantilever gantry, crawler gantry,
hammerhead, ingot-pouring, jib, locomotive, motor truck, overhead
traveling, pillar jib, pintle, portal, semigantry, semiportal, storage
bridge, tower, walking jib, and wall cranes.

The term "derrick" shall mean a power-driven apparatus consist-
ing of a mast or equivalent members held at the top by guys or
braces, with or without a boom, for use with a hoisting mechanism
or operating ropes. The term shall include all types of derricks, such
as A-frame, breast, Chicago boom, gin-pole, guy, and stiff-leg
derricks.

The term "hoist" shall mean a power-driven apparatus for raising
or lowering a load by the application of a pulling force that does not
include a car or platform running in guides. The term shall include
all types of hoists, such as base-mounted electric, clevis suspension,
hook suspension, monorail, overhead electric, simple drum, and trol-
ley suspension hoists.

The term "high-lift truck" shall mean a power-driven industrial
type of truck used for lateral transportation that is equipped with
a power-operated lifting device usually in the form of a fork or
platform capable of tiering loaded pallets or skids one above the
other. Instead of a fork or platform, the lifting device may consist
of a ram, scoop, shovel, crane, revolving fork, or other attachments
for handling specific loads. The term shall mean and include high-lift
trucks known under such names as fork lifts, fork trucks, fork-lift
trucks, tiering trucks, or stacking trucks, but shall not mean low-lift
trucks or low-lift platform trucks that are designed for the transpor-
tation of but not the tiering of material.

20(a).

Minors under sixteen.—No minor under the age of 16 years shall
be employed, permitted or suffered to work in any gainful occupa-
tion as defined in this subtitle for more than 6 days a week or for
more than 3 hours on any school day nor for more than 8 hours on
any nonschool day, or for more than 23 hours in a week during which
school is in session for 5 or more days or for more than 40 hours
in any one week when the schools are not in session. In any one week
in which school is in session for less than 5 days, such child may be
employed for not more than 8 hours on any one day that school is
not in session, but in no case shall his total hours during such week
exceed forty. No minor under 16 years of age who is gainfully em-
ployed within the meaning of this subtitle shall be employed, per-
mitted or suffered to work before the hour of 7 a.m. or after the
hour of 7 p.m. except during the summer, June 1 through Labor Day,
when the evening hour will be 9 p.m.

23(d).

Certificates shall be issued in Baltimore City only by the Com-
missioner of the Department of Labor and Industry or by any person
designated by the Commissioner of Labor and Industry and in the
counties by the county superintendent of schools or by any person
designated by the county superintendent of schools. Employment
certificates for minors 14 and 15 years of age shall be issued only
upon application of the parent, guardian or legal custodian of the
minor or if the minor have no parent, guardian or legal custodian