Filter funnels
Cat.-No.	Por.	ml	A	B
			mm	mm
21 11 *	0-5	1000	120	22
21 12*	0-5	125	60	10
21 25 *	0-5	250	80	18
21 40 *	0-4	4000	175	30
21 50 *	0-5	50	35	10
21 55 *	0-5	500	90	22
21 75 *	0-5	75	45	10
21 80 *	0-4	8000	210	40
* Please mention the porosity!