Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26389588_1 (year_of_introduction VARCHAR, name___designation VARCHAR)

### Question ###
How many different years was the name/designation cetme?

### Accurate SQL ###

SELECT COUNT(year_of_introduction) FROM table_26389588_1 WHERE name___designation = "CETME"