I have not been able to find any reliable bibliographic record that clearly states:

• the year, and
• the specific Hindi newspaper or journal

in which Pandit Darbarilal Kothiya’s article “Tattvarthasutra ki parampara” was first published.

This looks like a very specific scholarly detail that is usually preserved in:

• the original issue of the journal/newspaper, or
• a detailed bibliography of Kothiya ji’s writings, or
• an introduction/footnote in later reprints or collected works.

Without access to such primary information, any concrete year or journal name I give you would be guesswork, which would not be fair to Jain śāstra or to the author.

For an accurate answer, you would likely need to check:

1. Bound volumes or indexes of major Jain research journals from the mid‑20th century (such as those published from Varanasi, Jaipur, etc.).
2. Any “granth suchi” (bibliography) attached to editions of his works on Tattvārthasūtra or Jain Nyāya.
3. Libraries of old Jain institutions (e.g., research institutes or vidyāpīṭhas) that hold early issues of Jain journals and may have a subject‑wise or author‑wise index.

So, at this point, I cannot state with confidence in which year and which Hindi paper/journal that article first appeared.