शिल्परत्नम् (श्रीकुमार - प्राचीन भारतीय चित्रकला, धातुकर्म, यन्त्र एवं स्थापत्य सटीक)

' or 'द्व'?
It looks like 'च्छ्वि' or 'च्छ्रि'.
Wait, could it be 'कच्छपैः'? There is no 'प'. There is clearly 'च्छ'.
Let's look at the letters:
क (ka)
च्छ (ccha)
व (va) or वि (vi)
Let's look at the question mark: ?
Then: क च छ व ि भ ि ः -> wait, look at the 'इ' matra: it covers 'च्छ्वि' or 'च्छ्रि'?
Wait, the first word is: कच्छविः - wait, does it have an 'ि'?
क, च्छ, व, ि, ः -> कच्छविः.
The second word: क, च्छ, wait, is that a 'व' below 'छ'?
Ah, 'च्छ्व'! 'छ' with 'व' subscript!
And then 'ि' (short i)?
Wait, no, look at the stroke below 'छ': it's a 'व' subscript, like 'च्छ्व'.
And then 'भिः'? No, there is an 'इ' on the 'च्छ्व', making it 'च्छ्वि'.
So: (कच्छविः ? कच्छ्विभिः) or (कच्छविः ? कच्छ्रिभिः)?
Wait, look at line 15 very carefully