I  imported your file in inkscape(0.48+devel r11311)
and the graticules exist ^^.
try change to outline view mode (ctrl+5 two times) and you will see all paths and shapes perfectly , but, exist paths  without colors, just apply any color .

2012/5/9 alvinpenner <penner@vaxxine.com>
confirmed on Windows 7, Inkscape The missing lines appear to be all
present in the Inkscape svg file, but they have the properties fill:none and
stroke:none so they are invisible. They are visible in other viewers, so
this is an Inkscape bug.

Alvin Penner

View this message in context: http://inkscape.13.n6.nabble.com/missing-element-graticules-after-ps-eps-pdf-import-into-inkscape-tp4963493p4964247.html
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