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No Plans, No Prototype, No Backup
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
That doesn't really apply because that trope deals mostly with prototypes that could not be mass produced for one reason or another while my examples are of things that were mass produced or at least had multiple copies already.
I think it's just a common side-effect of Lost Technology, coupled with Normal Fish in a Tiny Pond.
Would likely be able to be its own trope if we don't have it, though.
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I think No Plans, No Prototype, No Backup still applies. You are making it sound more narrow than it actually is.
This trope also applies to creations that, through some fluke of their creation, cannot be replicated for a variety of reasons.
Edited by Asherinka
A character has a unique combat vehicle or mech that no one else has. The vehicle was one of several (or many) identical vehicles in the beginning but the rest were all destroyed either in the beginning of the story or in the distant past (revealed in a flashback).
Basically the mechanical version of Last of his Kind.
Examples: Lagann in Gurren Lagann The first 3 Gundams in Gundam X J-Ark from Gao Gai Gar The Big Megadues trio from Big O The Deathshadows from the Harlock CG movie The titular Dunbine