What are some examples of secret sharing schemes actually being used in real-world applications? The concept of a secret sharing scheme is often attributed to Shamir (A. Shamir, How to share a secret, Comm. ACM, 22 (1979), pp. 612-613.) and Blakey (G. R. Blakey, Safeguarding cryptographic keys, in Proc. NCC, vol. 48, 1979, pp. 313-317.).

The overall idea is that some secret S is hidden from the participants who instead each receive a share si.  If every participant decides to cooperate, they each submit their share to a combiner, who reconstructs S from the shares si.

Papers on secret sharing schemes often refer to real-world applications (such as bank safes).  But I suspect, these are hypothetical "real-world" applications (i.e. the next floor down in the ivory tower) and very much doubt that they could actually name a bank (or any other company) that actually uses a secret sharing scheme.  Question:  What are some actual real-world examples?

Ideally, I would like an answer to contain:  At company X they use secret sharing scheme Y to safeguard Z (see ABC for more details).
(Almost) Every modern HSM (hardware secure module, for cryptographic applications) uses Shamir secret sharing. So, no, secret sharing use is wide spread.