Northern Electric QSK10D Practice Wanted

[RotoTech99]

Dear Forum:

In another topic, I asked about the NE QSK10D kit,which is similar to a WE 581A kit, or component kit of similar design.

I am still trying to locate the practice section mentioned in the NE Cradle and Chestphone practice...

Attached is a photo of a QSK10D installed in a Decotel chestphone.

If anyone, please knows of the practice section I am looking for, please email me or reply to this topic.

The first photo is a overall view of the QSK10D, the second shows its QNB18C network.

Thank you,
Rototech99