against estate for reasonable value of services furnished decedent, 65 A.L.R.2d 945.
Admissibility of oral evidence to show that a writing was a sham agreement not intended to create legal relations, 71 A.L.R.2d 382.
Admissibility of parol evidence to connect signed and unsigned documents relied upon as memorandum to satisfy statute of frauds, 81 A.L.R.2d 991.
Evidence of known and established usage shall be admissible to aid in the construction of contracts as well as to annex incidents.