Quick view Add to Cart Illustrated Parts Breakdown for Inverter Models F20-4, F21-4, F20-4M and F21-4M [feb21desa17] Document Part Number: T.O. No. 8C7-3-2-4 Number of pages: 28Part Number: T.O. No. 8C7-3-2-4Revision Date: 23-Feb-1960Description: Manufactured By: Jack & Heintz MSRP: Was: Now: $19.62