With the years, I learned to appreciate a lot this developer which I discovered in a marginal mention by Crawley quoted (with a misprint) in Anchell & Troop's Cookbook.

However, I never saw its formula or history quoted in any printed source.
Since Adox (C. Schleussner Fotowerke) disapeared in 1963, I suppose it was formulated before, but when ?
Does anyone knows something about the place and date of conception and where the formula was first published ?