Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum
Signal relay box, vertical type, containing 3 relays
Science Museum Group
© The Board of Trustees of the Science Museum