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_name_1 ( quantity INTEGER, class_from_1928 VARCHAR )

### Question ###
What's the sum of Quantity for the Class of 1928 of CI-30?

### Accurate SQL ###

SELECT SUM(quantity) FROM table_name_1 WHERE class_from_1928 = "ci-30"