Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the district Incumbent Julius Kahn was in that was smaller than 1906?

### Inputs:
table_name: table, columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']

### Response:
SELECT District FROM table WHERE First elected < 1906 AND Incumbent = julius kahn