This engine with a cylinder size of 20 x 26 and a firebox of radial-stay was built when?
CREATE TABLE table_25695027_1 (
    years_built VARCHAR,
    cylinder_size VARCHAR,
    firebox VARCHAR
)
SELECT years_built FROM table_25695027_1 WHERE cylinder_size = "20 ½” x 26”" AND firebox = "Radial-stay"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: This engine with a cylinder size of 20 x 26 and a firebox of radial-stay was built when? ### Input: CREATE TABLE table_25695027_1 (
    years_built VARCHAR,
    cylinder_size VARCHAR,
    firebox VARCHAR
) ### Response: SELECT years_built FROM table_25695027_1 WHERE cylinder_size = "20 ½” x 26”" AND firebox = "Radial-stay"