Abstract: A fluid filter for preventing the introduction of fluid contaminants into an associated device is disclosed. The filter has a housing having an inlet chamber and an outlet chamber. The inlet chamber forms an inlet port of the fluid filter and the outlet chamber forms an outlet port of the fluid filter. A number of serially connected intermediate chambers are coupled between the inlet chamber and the outlet chamber. Each of the chambers contains an absorbent material for capturing the fluid contaminants and generally preventing their introduction into the associated device.

Abstract: A method of making a machine readable data symbol marking on an article to be marked is disclosed. The symbol is marked on the article using a stain. The stain includes particles of conductive materials. An electric current is then induced in the area of the symbol and through the conductive materials. The electric current is used to generate heat in the conductive materials, wherein the heat causes the symbol to be fused to the article.