Typewritten wills in California generally require the signatures of two witnesses to be found valid, but the harmless error rule can save the day. Probate Code section 6110(c)(2), as recently discussed, provides that a will not properly executed may be admitted to probate if the proponent “establishes by clear and convincing evidence that, at the time the testator signed the will, the testator intended the will to constitute the testator’s will.”