| http://www.w3.org/ns/prov#value | - The door'29 is preferably, but not necessarily, made of glass, plastic or other transparent material so 'that. the operation :of the machine may -be observed visually through openings 18A in the frame meniber 18. .Each side of the door 29 centrally thereof, is provided with a counter-sunk recess 30 arranged to receive a sealing and cushioning washer 31 made of rubber or other suitable resilient ma
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