Polar pattern switch?

[Greenie]

What kind of polar pattern switch is used in three way polar pattern switch?

 

[Khron]

Most often a 3-position center-off (on-off-on) switch, if we're talking "retail" components.

 

[Drosselmeier]

pattern switch of a poor man ))

 

[Khron]

pattern switch of a poor man ))
View attachment 98669

What mic's that in/from?

 

[Drosselmeier]

my version of diy "u87ai"