Used condition; may have wear and age related marks. See pics for condition / what’s included / testing conducted. TEL Tokyo Electron TKB7004 IO SPIN #04 TEU203-21 OCSI UNIT PCB Tokyo Electron industrial I/O control board marked TKB7004 and IO SPIN #04. Semiconductor-equipment spare listings independently associate TKB7004 with a TEL TEU203-21 OCSI UNIT board. Four units are in stock. Condition: Used industrial surplus item with possible age, storage and cosmetic wear. Untested unless explicitly stated; see photographs for exact condition and included parts. Please match the exact manufacturer part number, model, revision and visible connectors/specification to your application before purchase. Includes x1 TKB7004 board per purchase x4 units available.