Its wordings
Arbitration Act
Article 16, paragraph (1)
第十六条第一項
Each amendment that changed this provision, and each that will, oldest first. Each is shown against the wording just before it; where an amendment gives the provision another number, it is followed under the new one. Read it as it stands today
In force today
The number of arbitrators is as prescribed by the agreement of the parties.
仲裁人の数は、当事者が合意により定めるところによる。