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What is claimed is:
`
`1.
`
`An ultra—low temperature freezer comprising:
`
`an insulated case defining a storage compartment
`
`having an opening in an upper face;
`
`an insulated door configured to be able to open and
`
`close the opening;
`
`a first refrigeration unit configured such that a
`
`first compressor, a first condenser, and a first
`
`decompressor are mounted on a first mounting board;
`
`a second refrigeration unit configured such that a
`
`second compressor, a second condenser, and a second
`
`decompressor are mounted on a second mounting board;
`
`a machinery compartment provided adjacent
`
`to the
`
`insulated case,
`
`the machinery compartment being configured
`
`to house the first refrigeration unit and the second
`
`refrigeration unit so as to be independently drawable in a
`
`horizontal direction; and
`
`a control unit where a control circuit is mounted; the
`
`control unit being configured to be drawable independently
`
`of the first refrigeration unit and the second
`
`refrigeration unit,
`
`the first refrigeration unit,
`
`the second refrigeration
`
`unit, and the control unit being housed in the machinery
`
`compartment so as to be stacked in a vertical direction.
`
`2.
`
`An ultra—low temperature freezer according to claim
`
`1, further comprising:
`
`a control—unit—mounting board where the control unit
`
`is mounted,
`
`the control—unit—mounting board being
`
`integrally configured with the control unit, wherein
`
`5
`
`lO
`
`15
`
`20
`
`25
`
`30
`
`39
`
`

`

`the control—unit-mounting board including
`
`a main body portion including a mounting hole
`
`through which the control circuit is mounted, and
`
`a reinforcing plate mounted along a lateral
`
`direction of the main body portion
`
`3.
`
`An ultra—low temperature freezer according to claim
`
`1, wherein
`
`an arrangement of the first compressor,
`
`the first
`
`condenser, and the first decompressor in the first
`
`refrigeration unit is identical to an arrangement of the
`
`second compressor,
`
`the second condenser, and the second
`
`decompressor in the second refrigeration unit.
`
`4.
`
`An ultra—low temperature freezer according to claim
`
`1, wherein
`
`10
`
`15
`
`the first mounting board includes a pair of first
`
`extending portions provided to a pair of side~edge
`
`portions along a drawing—out direction of the first
`
`20
`
`refrigeration unit, and
`
`the machinery compartment
`
`includes a pair of first
`
`rail members configured to guide the pair of first
`
`extending portions in the drawing out direction.
`
`25
`
`5.
`
`An ultra—low temperature freezer according to claim
`
`4, wherein
`
`the second mounting board includes a pair of second
`
`extending portions provided to a pair of side—edge
`
`portions along a drawingvout direction of the second
`
`30
`
`refrigeration unit, and
`
`40
`
`

`

`the machinery compartment
`
`includes a pair of second
`
`rail members configured to guide the pair of second
`
`extending portions in the drawing~out direction.
`
`6.
`
`An ultra—low temperature freezer according to claim
`
`1, wherein
`
`a first reinforcing portion is formed, on a lower
`
`surface side of the first mounting board,
`
`to extend along
`
`the drawing—out direction of the first refrigeration unit.
`
`7.
`
`An ultra—low temperature freezer according to claim
`
`6, wherein
`
`the first reinforcing portion is a plate member that
`
`is folded along the drawing—out direction of the first
`
`refrigeration unit and mounted to a lower surface of the
`
`first mounting board.
`
`8.
`
`An ultra—low temperature freezer according to claim
`
`6, wherein
`
`a second reinforcing portion is formed, on a lower
`
`surface side of the second mounting board,
`
`to extend along
`
`the drawing—out direction of the second refrigeration unit.
`
`10
`
`15
`
`20
`
`9.
`
`An ultra«low temperature freezer according to claim
`
`25
`
`8, wherein
`
`the second reinforcing portion is a plate member that
`
`is folded along the drawing—out direction of the second
`
`refrigeration unit, and mounted to a lower surface of the
`
`second mounting board.
`
`30
`
`41
`
`

`

`10.
`
`An ultra-low temperature freezer according to claim
`
`6, wherein
`
`the machinery compartment
`
`includes a first support
`
`member that provides support,
`
`from below, at the first
`
`reinforcing portion when the first refrigeration unit is
`
`drawn out
`
`in the drawing—out direction and
`
`a height of the first reinforcing portion is set to a
`
`height at which the first reinforcing portion contacts the
`
`first support member when the first refrigeration unit is
`
`10
`
`drawn out.
`
`11.
`
`An ultra-low temperature freezer according to a
`
`claim 10, wherein
`
`15
`
`20
`
`the machinery compartment
`
`includes a second support
`
`member that provides support,
`
`from below, at the second
`
`reinforcing portion when the second refrigeration unit is
`
`drawn out
`
`in the drawing—out direction, and
`
`a height of the second reinforcing portion is set to a
`
`height at which the second reinforcing portion contacts
`
`the second support member when the second refrigeration
`
`unit is drawn out.
`
`42
`
`

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