31385588calculating machinesPT2026-03-30 20:53:13UF31385589calculating machineNDUF31385590calculating machinesNDUF31385591machines, calculatingNDBT31385571analog data processorsPTNT31385599billing machinesPTNT31385602bookkeeping machinesPTNT31385672difference enginesPTNT31385772tabulating machinesPT