Why would any manufacturer still produce screws with a slot head

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Phillips and hex heads look better still As for driving with power tools you cannot beat Robertson or hex head screws Slot screws would only

philip slot Phillips and hex heads look better still As for driving with power tools you cannot beat Robertson or hex head screws Slot screws would only

philips slot Philip Middleton Justice in the Great Seal Patent Office on the 17th slot with inwardly projecting shoulders at the top , sufficient space being