Do the Lukyanov Water Integrator's dates, purpose, and service history rest on more than one Tier-4 source?

The note claim-lukyanov-water-integrator-1936-hydraulic-differential-equation-solver rests entirely on the Tier-4 Wikipedia article Water integrator. Its load-bearing specifics are all single-sourced:

• the 1936 build date,
• that it solved partial differential equations for concrete-crack / thermal prediction,
• export to China, Poland, Bulgaria, and Czechoslovakia, and
• continued official use into the 1980s (canals, railways, rocket production).

For an obscure, load-bearing historical entity this clears only the "uncontested Tier 3–4" bar weakly, so the claim is flagged [unverified-source].

What would answer it:

• The Polytechnic Museum (Moscow) holdings/records for Lukyanov's integrator, which preserves surviving units.
• Lukyanov's own publications or a Soviet-era engineering history (e.g. accounts in the history of analog computing by A.N. Krylov's milieu, or Russian secondary histories with citations).
• An English-language scholarly history of hydraulic/analog computation that cites primaries rather than repeating the Wikipedia summary.

This also underwrites the independence framing in claim-hydraulic-analog-computers-independently-invented-economics-engineering: confirming Lukyanov's 1936 priority and isolation from the British work is what makes the convergence genuinely independent rather than tidy. Note stays seedling until a primary or institutional source is read.