Input previously achieved gun research year and year to be researched, then click "Calculate". Results appear in results fields below.
Base Cost (example: "0.50"):	0.5 - Gun > 210mm 0.25 - Gun <= 210mm
Naval Artillery Tech Year Achieved (example: "1915"):	1885 1900 1905 1910 1915 1920 1925
Naval Artillery Tech Year Required for Gun to be Researched (example: "1905"):	1885 1900 1905 1910 1915 1920 1925
Results: