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BS EN ISO 5353:1999
Earth-moving machinery, and tractors and machinery for agriculture and forestry. Seat index point (British Standard)
States a method and the device for use in determining the position of the seat index point (SIP) for any kind of seat designed for earth-moving machinery as defined in ISO 6165, and tractors and machinery for agriculture and forestry as defined in ISO 3339-0.
British Standards Institution [bsi]