Figure 48(a) shows bench back support in plan view 42 inches in length minimum; figure (b) side elevation of back support extending 2 inches maximum above the top of the seat to a point 18 inches minimum above the seat.
 

Figure 48(a) shows bench back support in plan view 42 inches in length minimum; figure (b) side elevation of back support extending 2 inches maximum above the top of the seat to a point 18 inches minimum above the seat.

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