MILAN — In a business setting perfect for the moment, Gov. Kelly Ayotte last Friday ceremonially signed into law a bill seen as crucial to the state’s lumber industry, one that puts it on an even playing field with how Canada grades its lumber. Local elected officials, employees and guests gathered at the Milan Lumber Co., for the signing of House Bill 1204, that changes how New Hampshire grades state-grown timber for sale. The change removes an “s” at the end of three other letters, s-p-f, standing for spruce-pine-fir, which is how Canadian lumber is marked. Before the Legislature passed the bill, the state’s lumber was marked as s-p-f-s. The “s” at the end stands for “south,” meaning south of the Canadian border. Removing the extra “s” at the end of New Hampshire milled lumber means it is graded the same as Canadian milled lumber and should be sold at the same price.