(b) Chauffeurs, truckdlrivers, and their helpers: One hundred
eighty (180) hours in any period of four (4) consecutive weeks,
provided, however, that time worked in excess of nine (9) hours in
any one day or forty-five (45) hours in any one week shall be paid
for as not less than time and one t.hird.
 (c) Engineers, firemen, electricians, filter plant employees, elec-
tric and hlydroeflectric operators: One hundred sixty-eight (168)
hours in any period of four (4) consecutive weeks, provided, how-
ever, that time worked in excess of nine (9) hours in any one day or
fortyr-Hye (45) hours in any one week shall be paid for as not less
than time and one third.
 (d) All other laborers, mechanical workers, or artisans employed
in any plant, mill, or factory or on work connected with the opera-
tion of such p~lant, mill, or factory: Eight (8) hours in any one da~y
and forty (40) hours in any one week, provided, however, that these
maximum limits may be exceeded for any reason at any timne provided
that all time worked in excess of! the maximums prescr~ibedt shall
be paid for as not less than time and one third, and plrovidedl, fur-
th~er, that no employee shall be required or permitted to wor~k in
excess of ten (10) hours in any one day or forty-eight (48) hours in
any one week.
 (e) Emnployees r~egularly engaged in a mnannagerial or executive
capacity and their personal secretaries, foremen and supervisors,
receiingr thiirty-five ($35.00) dollars or more per week, outside sales-
mnen and outside servicemen: N~io limitation.
 (f) All other eprloyees:; Forty~-eight (48) hour in any one week
but not to exceed three hundred twenty (320) hours in any period
of eight (8 )consecutive veek~s.
 2No limitation contained in said schedule shall applyl! to emlployr-
ees of any class when engaged in emnergency repanis or emergency
maintenance wor~k ocensioned by br~eakdowns 'or: involving protection
of life or property, provided, however, that all time worked in
excess of the limnitations prescribed in. saidl schedule shall be paid
for as not less than time and one thirdl.
 3. No employer shall knowingly permit any employee to workl for
anly time which, when totaled with that already pe~rform-~ed wvit~h
another employer or employers in this Industry, exceed~s t~he maxi-
mum permitted herein.
 ARTICLE ITT-- VAGCES

 1. The minimum rate of wage of any laborer, mnechnni~cal worker
or artisan employed in any plant, mill, or factory or on work con-
nect~ed with theL operation of any such plant, mill, or factory shall
be as follows:
 (a) In the NIorthern. zone, which shall consist of all the terri-
tory of the .United S~tates except the States namedl inl subdivision
(b) hereof :
 Mlale labor, 40 cents per hour.
 Female laibor, 35 cents per hour.