Kubota M6S-111 Operator's Manual page 46

IMPLEMENT LIMITATIONS
Optional equipment such as operator protective structure (OPS), falling object protective structure
(FOPS), etc. to deal with these hazards and other related hazards is not available for this tractor. Without
such optional equipment, use is limited to tractor specific applications like transport and stationary work.
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M6S-111,M6L-111,M6H-101