I can’t make out the mystery word, but I took a good look at the rest of the sentence and have these thoughts that I hope might spark something with somebody else.
Initial thoughts - (assumption that this was written by one person)
1. Note how spaced out the writing is: ‘tanks’ at the end of the first line, and ‘mfgrs’ at the end of the second. See how much space each of these five letter words uses. Whoever wrote this writes in a relaxed spacing of letters that suggests the mystery word might well include less (not more) letters than first meets the eye.
2. Note the spacing of ‘installed’ at the start of the second line, immediately below the ‘mystery word’. At nine letters, it takes up about the same space as the mystery word. From this, I believe the mystery word is nine letters long.
3. I do not believe the mystery word is two words totaling nine letters as the gaps between the words are consistently prominent and I do not see any gaps in the mystery word to suggest it’s actually two words.
4. Note the ‘tails’ hanging down below the line of the letters ‘g’ and ‘f’ in ‘fuel’ ‘by’ ‘original’ and ‘mfgrs’. The tails are distinct ‘fat’ loops compared to the upper strokes in ‘f’, ‘t’, and ‘d’. I do not see any trace of a ‘fat tail’ in the first work - I don’t think there’s letter with a tail: p, g, y, etc.
5. Note the letters ‘t’ in ‘tanks’ and ‘installed’. The upper portion of the ‘t’ is a single line (not a loop), and has a distinct ‘cross’ to make the ‘t’. The letter ‘f’ in ‘fuel’ cannot be mistaken for a ‘t’ (fat loop below); it looks like the mystery word has two ‘t’s with two letters between them.
6. Note the ‘s’ in ‘mfgrs’. It looks similar to the small letter just prior to the second ‘t’. ‘st’
What I think I’m looking at is a capital letter followed by two small letters then a ‘t’; one more small letter and then ‘st’. The last three are almost nonexistent, but look to me like three small letters and a ‘d’. Some endings that meet these criteria include: timed, tuned, but they dont’ fit with the rest of the word.
Just my two cents. Time to feed the livestock, but I’ll get back to this after dinner.