Making a model by laser scanning with structured light was a known process in the early 1970s. It was used by Ford Motor to get from clay models of cars to metal dies used to stamp out body parts. Previous approaches involved plaster casts and mechanical tracing machines.
However, a computer tablet was beyond 1970s technology to even analyze, let alone duplicate.
I doubt they'd be able to duplicate it, since there's a whole manufacturing infrastructure they'd have to duplicate first. But I doubt they'd have any trouble analyzing it. By 1970 they had integrated circuits, and there were people who were already looking ahead to the possibilities. It's not that hard to pop the plastic off of an IC and look at it with a microscope.
Based on the gestalt of the time, they'd probably look at the tablet and think you should have something more advanced by 2015.
And wonder why the UI was so inconsistent ^_^.
As for ICs, the "standard" 7400 series dates back to the mid-60s: https://en.wikipedia.org/wiki/7400_series They'd be impressed by the surface mounting, but that's not a great leap from through hole DIPs. They'd be really impressed by the CPU, since computing resources were so hard to get back then, but putting it all on a single chip is obvious, and e.g. the 4004 dates back to late 1971. Even DRAM dates back to the mid-60s (IBM), with the 1103 (Intel's first DRAM, a whopping 1024 bits) being sold stating in late 1970 (albeit with low yields for a while).