Pop Up Bass Heads

[SVTFretless]

Does anyone recall who produced the bass Amps in the late 60's-early 70's that featured a head that rose up out of cabinet via a motorized mechanism when you turned it in ?
Not Ampeg, Guild, Sumn, but ...??????

 

[Phendyr_Loon]

Oliver.

 

[SVTFretless]

Thanks so much! The Oliver 500 Powerflex! Great video on You Tube. Thanks again.