I do not see why you think "Exhibit II" on the one hand and "DX-3095" and the "DX-2085" follow the same naming pattern.
To me, the first looks like a marketing name, and the second like one that only makes sense to the manufacturer. I am assuming that the numbers do have meaning here.
Marketing names may or may not be intended to be short-lived. Sometimes, they just become short-lived, either because of how they behave in the market (see: Edsel), of internal politics (a new brand manager steps in; (s)he cannot claim the previous manager did a fine job, so something must change), or due to short-term profit hunting ("device named 'X' sells well! Let's make a low-budget one and sell even more!"-"But we would have to cut quality to make it cheaper"-"Yeah so?")
There also seems to be this notion "if consumers are confused, they will pick a brand at random. The more brands there are, the easier they get confused. I will make lots of brands, so that they will get confused, and pick a random brand. Since I have so many brands, chances are they will pick mine.". That approach leads to short-lived brand names.
As to that DX-3095 naming scheme: chances are that it was taken directly from the manufacturer's internal tracking system. The first digit might indicate the factory or the PCB version, or whatever, the second the quality of the tube, etc. That may or may not give useful information to customers.
To me, the first looks like a marketing name, and the second like one that only makes sense to the manufacturer. I am assuming that the numbers do have meaning here.
Marketing names may or may not be intended to be short-lived. Sometimes, they just become short-lived, either because of how they behave in the market (see: Edsel), of internal politics (a new brand manager steps in; (s)he cannot claim the previous manager did a fine job, so something must change), or due to short-term profit hunting ("device named 'X' sells well! Let's make a low-budget one and sell even more!"-"But we would have to cut quality to make it cheaper"-"Yeah so?")
There also seems to be this notion "if consumers are confused, they will pick a brand at random. The more brands there are, the easier they get confused. I will make lots of brands, so that they will get confused, and pick a random brand. Since I have so many brands, chances are they will pick mine.". That approach leads to short-lived brand names.
As to that DX-3095 naming scheme: chances are that it was taken directly from the manufacturer's internal tracking system. The first digit might indicate the factory or the PCB version, or whatever, the second the quality of the tube, etc. That may or may not give useful information to customers.