Handley Page Bomb Selector Switch

[462SQN RAAF]

Hi, I got this from my grandads estate via my fathers estate. Pop was a wireless operator in the pre WW2 merchant navy (once watched HMS Warspite cut a Greek fishing boat clean in half in the Mediterranean), and he had amassed switches and gadgets of all sorts over his life.
Anyone know which HP aircraft this would have come out of?
It's markings are;
HANDLEY PAGE
BOMB SELECTOR SWITCHBOX
PATENT No 36486/30

 

[SaparotRob]

Love the story as much as the pictures.
HMS Warspite is my favorite
RN ship.