Full text
where the property was depreciable property of a prescribed class, the lesser of the capital cost to the taxpayer of the property, and the amount, determined immediately before the time of the disposition of the property, that is that proportion of the undepreciated capital cost of property of that class to the taxpayer that the capital cost to the taxpayer of the property is of the capital cost to the taxpayer of all property of that class that had not, at or before that time, been disposed of, and