The Case of the Irate Inventor

A woman comes to Perry Mason's office concerned about a looming deadline in a partnership agreement that involves her husband, who disappeared three months prior.
PM: Let’s put Paul Drake to work, Della. Sometimes the mills of the police department grind exceedingly slow.

In short order, she's dead, he's accused.
PM: You disappeared for three months. The evening you returned she was murdered. Why did you come back?
Def: I suddenly remembered the buyout clause in the contract.

PM: Your wife said that you and she had a wonderful marriage, that you’d never had any trouble.
Def: Oh, we did [have a wonderful marriage]. For the first day or so of our honeymoon.

This episode of Perry Mason revolves around an invention that would prevent airplane collisions. The firm developing the device has three partners -- two brothers and an engineer (the defendant). The head bro was played by Ken Lynch and it's odd to see him in this type of role. He's usually a bullying cop or other untrustworthy sort.
Ken: I’ve heard of some of your courtroom maneuvers, Mr. Mason. We’re dealing with words on paper. (Verbal barrage that boils down to: We’ve got you dead to rights.)
PM: Read your contract very carefully. I’ll be at my office at 10:30 in the morning.

Next morning, the brothers have read the contract but they skipped past the part that PM had already put into play. Let's add contract maneuvers to Mason's reputation!
Ken: Mason, we want that anti-collision device. We’ll make trouble.
PM: Not by talking about it.

Perry confronts another player in the invention scenario. As the man tries to defend his role in the development of the device, Perry calls him "foolish" and chastises the guy on his self-inflicted career damage.
PM: Weren’t you second in your class at Cal Tech? With an excellent potential in scientific work?

Burger's back! Nothing's changed.
HB: Counsel’s on a fishing expedition. I move that this testimony be stricken from the record.

And the denouement.
Witness: A person has a right to protect himself.
PM: What person?
What person?
And thus begins a litany of questions specific to the crime, each one prefaced with
What person ...

Raymond Burr as Perry Mason: What a person!