`
`1.
`
`A working chamber comprising:
`
`a bex—shapedixxklease ireludlnqaiwerx;space31*as,1nterlor
`
`tee reef and.an insertien portion,
`
`in a front surface thereof,
`
`to
`
`w1ica a worker’s arm is inserted;
`
`a supply unit eenfigured t0 supply,
`
`inte the werk space,
`
`as in an exterior of the body case threugh a supply filter;
`
`a louver that gu.ifies gas suppliex intc the work space by
`
`the supply unit to a back surface side of the work space after
`
`the gas passes through the supply filter; and
`
`an.illuminating means pesitioned lower than the louver and
`
`in frent 0f the leuver in the werk space,
`
`in an upper yaart of the
`
`work space in the body case,
`
`at
`
`least
`
`as surface cf
`
`the leuvery whi m:
`
`races
`
`tie
`
`illuminating means, bei-ng a refJ.ectjen surf ace.
`
`U?
`
`10
`
`t.) Ul
`
`2.
`
`The werking chamber
`
`accerding to claim 1,
`
`further
`
`cempris ing:
`
`a disscharge filter prev;Jedd at an upper rear ef the bedy
`
`a discharge unit cenfigure‘ te discharge air in the werk
`
`space to the outside through the discharge filt
`.i
`
`; and
`
`Ix) if:
`
`apartition 11g pla te ' hat is previecz-
`1I
`1
`of the bedy case to farm a ventinatien passage between a back
`.
`.
`
`aab ck sur: ace side
`
`surface cf the bedy case and thejpartitlonizg}plate and partltuen
`
`air currents ints supply air and discharge air“
`
`3.
`
`.4
`The working chamber accordina t0 claim 1, wherein
`
`the leuver includes agxnfiLbetweeneulupper part andexlewer
`
`
`
`part thereef, whnchihaeaxshape swellingixzthe illuminatingtneane
`
`a
`
`side.
`
`4.
`
`The wcrking chamber according to Claim 2, wherein
`
`the louver includes a part between an upper part and a lower
`
`part thereaf, whichiuisaxshape swellingtx3the illuminatingzneane
`
`side.
`
`
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