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Media pixel size and maximum width

I am trying to create a rule that includes / excludes based on both the maximum and pixel level of the device. For example, if I want the Kindle Fire @ 600px to be excluded, but the iPhone5 @ 640 (smaller real-world screen) should be running.

Does the following rule execute AND or OR? Assuming that this makes the OR rule, how do I create a rule that executes a function of type AND (should pass both the "2 pixels" and "maximum width 749px" values),

@media only screen and (min--moz-device-pixel-ratio: 2), 
        only screen and (-o-min-device-pixel-ratio: 2/1), 
        only screen and (-webkit-min-device-pixel-ratio: 2), 
        only screen and (min-device-pixel-ratio: 2),
        only screen and (max-width: 749px){
        }

EDIT BELOW:

Well, that’s what I still have, I guess that commas are OR, and “and” are obviously AND. It's right? I am trying to make a more universal set of requests, focused not only on iPhones / iPads ...

@media
only screen and (max-device-width : 721px) and (orientation : portrait) and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (max-device-width : 721px) and (orientation : portrait) and (min-device-pixel-ratio: 1.5),
only screen and (max-width: 359px) {
/* All Portrait Phones */
}

@media
only screen and (min-device-width : 360px) and (max-device-width : 999px) and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (min-device-width : 360px) and (max-device-width : 999px) and (min-device-pixel-ratio: 1.5),
only screen and (max-width: 999px) {
/* Small tablets (assume vertical) and landscape phones */
}
/*note - Anything over 999 wide to render fully - desktop, landscape or large tablets */
+5
2

mediaqueries iPad Retina.

@media only screen 
and (min-device-width : 768px) 
and (max-device-width : 1024px) 
and (orientation : portrait)
and (-webkit-min-device-pixel-ratio: 2) { /* STYLES GO HERE */ }
+10

, , - - Restive.JS(http://restivejs.com).

, - .

:

<!-- Install JQuery version 1.7 or higher -->
<script type="text/javascript" src="jquery.min.js"></script>

<!-- Install Restive Plugin -->
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<!-- Setup Plugin -->
<script>
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    $('body').restive({
        breakpoints: ['10000'],
        classes: ['nb'],
        turbo_classes: 'is_mobile=mobi,is_phone=phone,is_tablet=tablet,is_landscape=landscape'
    });
});
</script>

CSS :

/** For Desktops **/
#sidebar {display: block; float: right; width: 320px;}

/** For Phones **/
.mobi.phone #sidebar {display: none;}

/** For Tablets in Landscape Orientation **/
.mobi.tablet.landscape #sidebar {display: block; width: 35%;}

CSS , CSS Media Query. , ID , CSS, .

:

-1

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