Value, Labor, Invention

Spinoza's primary interest in tools is regarding the fact that the making of one usually requires the pre-existence of another, etc., suggesting an infinite regress that approaches an original invention.  His concern is germane to Marxism, the focus of which is Labor aided by tools, aka the 'means of production', the status of which is the decisive factor in the transition from Capitalism to Socialism.  But, while Marx's primary attention is on ownership of the tools of Labor, implicit in the latter is that they themselves are products, suggesting a regression to an original act of Labor, i. e. to some Invention.  Now, in Marx's immediate purview, the latter is plainly the steam-engine, the foundation of the existence of most of the equipment and processes that are the means of production in his era.  Still, while he is certainly mindful of the significance of the Industrial Revolution in the transitions from Feudalism, to Capitalism, to Socialism, he does not seem to quite appreciate that correspondingly underlying a Labor Theory of Value is an Invention Theory of Value.