Métallique an electro-magnetic driver

Hi,

I want to build something like this :


Originally developed for the Ondes Martenot electronic instrument in 1928, the "Métallique" is a musical loudspeaker construction with a brass / metal surface as a membrane, stimulated by an electro-magnetic driver.

What kind of electro-magnetic driver I can use for building something like this?

Cheers!

Did you see these? **broken link removed**
From here, https://thekingofgear.com/post/97310190665/building-your-own-palme-diffuseur-updated

Or these?https://www.google.com/?gws_rd=ssl#q=speaker+transducer
From here, https://www.muffwiggler.com/forum/viewtopic.php?t=116873 Lots more on Google.

But none of the ways you do it will make the real Ondes Martenot electronic instrument sound.

shortbus= Thanks exactly the keyword I was looking for (speaker transducer)! & thanks for all the link.
Cheers