Need help understanding the datasheet for a 70 year old M1752 Transistor

[RonFred2]

I have one of the limited supply of the first grown-junction transistors called the M1752. This germanium part was sent to some 200 labs as a prototype to see what changes would be needed to make commercial grade junction transistors.

The packing envelope (I am calling it the datasheet) has several values:
Alpha: .9927
Rc: 6.2
Rb: 5,000
Re: 13.0
Ico: 0.7 uA
Ze: 8 V
ZC 80 V

I understand the "Alpha" but I wonder what the remaining resistance, current and Z values mean?
For example is this some short hand for a bench circuit setup with resistance and voltage / current? If so anyone know what that circuit might look like?

I am attaching my test results for this part using a Peak DCA Pro. But I am thinking that the test values by default may be wrong. I can adjust the range and step values for curve traces but having the envelop values is not enough for me.

[Dunckx]

Have a look at the Internet Archive's collection of early transistor papers:

https://archive.org/search.php?query=%28transistor%29%20AND%20date%3A%5B1948-01-01%20TO%201960-01-01%5D

There's several examples from the BSTJ such as:

https://archive.org/details/bstj31-3-411/page/n27/mode/2up published 1952 which even mentions the M1752.
https://archive.org/details/bstj35-1-1/page/n5/mode/2up which describes early work (1956) on the junction transistor.

There are lumped circuits in the latter showing various values of equivalent resistance and maybe the parameters on the envelope you have are connected.  Just a guess.

See also https://archive.org/details/transistoramplif00baue which could be of interest, it's a 1957 study on transistor amplifiers.  The R values could be input resistance with output AC open or shorted, or output resistance with input AC open or shorted.  I think if you want an interpretation of those numbers on the envelope, the early days of transistor research are the most likely to yield relevant answers.

My 2p worth.

[magic]

The last two could be breakdown ratings, and not sure if the big Z is part of that.

[RonFred2]

Thank you Dunckx:

I also found this doc on archive.org

This one is all about the M1752: "Properties of junction transistors" https://ia801602.us.archive.org/22/items/Q00016/Q00016.pdf

I am going to study the references you have suggested.

[cheater]

I wonder how you came about this transistor? That's a very cool find!

[RonFred2]

I bought my M1752 (M-1752) on ebay from the Southwest Museum of Engineering,
Communications and Computation: smecc.org

They have a few more of these M1752 for sale on ebay along with other parts.

The smecc.org is looking for funds to update their building post-COVID as I understand it.