What is the model number introduced May 1999?
CREATE TABLE table_10528691_4 (model INTEGER, introduction VARCHAR)
SELECT MAX(model) FROM table_10528691_4 WHERE introduction = "May 1999"
### Context: CREATE TABLE table_10528691_4 (model INTEGER, introduction VARCHAR) ### Question: What is the model number introduced May 1999? ### Answer: SELECT MAX(model) FROM table_10528691_4 WHERE introduction = "May 1999"