TY - BOOK ID - 128196101 TI - Invention protection for practicing engineers AU - Arnold, Tom AU - Vaden, Frank S. PY - 1971 SN - 0389005002 PB - New York : Barnes & Noble, DB - UniCat KW - Patents UR - https://www.unicat.be/uniCat?func=search&query=sysid:128196101 AB - ER -