AHMEDABADS historic pols , the self-contained enclaves of splendid havelis harking back to medieval times, are vanishing. They are ageing and neglected, of course. But more appallingly, mercenary vandals are pulling down the havelis and erecting concrete conurbations on their graveyards. And out of the debris of this slain history has arisen a flourishing trade in exquisitely carved and inlaid wood-work, artefacts and furniture that once graced the dismantled mansions.