List of siege artillery

Columns: Caliber ( mm ) | Weapon name | Country of origin | Design
149.1 | 15 cm Ring Kanone C/72 | German Empire | World War I | 149.1 | 15 cm Ring Kanone C/92 | German Empire | World War I | 149.1 | 15 cm Ring Kanone L/30 | German Empire | World War I | 149.1 | Type 96 15 cm cannon | Japan | World War II | 152.4 | 6 inch siege gun M1877 | Russian Empire | World War I | 152.5 | BLC 6 inch siege gun | United Kingdom | 1902 - 1915 | 152.4 | 6 inch siege gun M1904 | Russian Empire | World War I

Example questions:
Of the 120 caliber breech-loading siege guns what French advancement was given to the latest model ? | The earliest Russian designed breech-loading siege artillery listed was used in a conflict that was proposed to be ended in what legal body ? | The earliest developer of breech-loading siege artillery listed was founded on what date ? | One 149.1 caliber breech-loading siege gun was recommissioned from what function to a siege piece ? | The smallest caliber breech-loading siege artillery was used first in what war ?

Answers:
recoil system | Arbitration Court at The Hague | 1 January 1871 | naval gun and coastal artillery piece | Franco-Prussian War