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“Acme” spray nozzle, 151
“Adams-Cutler” distributor, 135
“Aerat” distributor, 145
Apparatus for contact beds, 205
” for dosing tanks, 167
” for measuring flow, 232
” for percolating filters, 106
” for sludge removal, 40
” for sterilisation, 242
Auto-mechanical syphons, 168, 169, 180