California Codes, Civil Code - CIV, Division 2 — Property, Part 4 — Acquisition of Property, Title 3 — Accession, Chapter 2 — Accession to Personal Property, Section 1026
That part is to be deemed the principal to which the other has been united only for the use, ornament, or completion of the former, unless the latter is the more valuable, and has been united without the knowledge of its owner, who may, in the latter case, require it to be separated and returned to him, although some injury should result to the thing to which it has been united.
Notes
Defines the principal part of combined property as the part for whose use, ornament, or completion the other part was joined. If the added part is more valuable and was joined without its owner’s knowledge, that owner may require separation and return even when separation injures the property to which it was joined.
Use as reference
Lexinter.net | California Code, Civil Code - CIV § 1026 | https://laws.lexinter.net/codes/california/civil-code/division-2/part-4/title-3/chapter-2/section-1026