Mandra , mandari is traced to Santali Language.
Mandra we all know is low tone or now used to indicate lower sthaayi.
If this decipherment is accepted , then this is earliest use of a musical instrument/player to logographically represent another word.
Dr. Kalyanaraman's decipherment is based on the basic assumption that symbhols refer to metalwork calling cards/ledgers and wealth accounting, a reason they are found across the traded regions like mesopotamia.
At least left leaners should give it a thought, as they are so fond of ( in fact obsessed with), labor, production, toil and such
. AruvAl suttiyal , natchattiram comes to mind
But then there are references to kaRNi, KaRNika , rim of jar , the ear lobes of a jar sort of - rebus: scribe or accountant as well
. Holder of a writing instrument also is a toiler. Didn't Marx toil?