Bag Whistle Explanation

[paul]

The full bag whistle was a feature used by Eureka Williams on its TOL canned hams and by AB Electrolux on its TOL cylinders from the mid-'60s to the mid-'70s.

I'm wondering what other makes, if any, also used it how it operated.

Also, why was it discontinued?

It sounds like a a great concept to me (pun intended); although I have never heard one.

 

[cheesewonton]

Old Panasonic Jet Flow canisters from the early to mid 1980s had a bag whistle too.

 

[centralsweeper63]

I-vac commercial machines have that too. Good pun.