A one-time programmable cell includes an access transistor coupled to an antifuse transistor. During this process thiophene is chloromethylated in the presence of one or more compounds containing keto group and optionally it is transformed into the compound of the formula. The handle assembly has an electrical contact to make electrical connection with the grounding mechanism of the chassis upon the handle member being moved to a first position. The bag cage defines a bag cavity that hold a filter bag in a position spaced from the bag compartment wall so as to maintain a clear airflow passage.