water, [137], [209], [210], [211], [220]

Mower, [196]

Multigraph, [206], [208]

N

Natural gas, [30], [89], [219]

Needle, [187], [188], [191]

Nickel, [158]

Nozzle, [148], [149]

O

Oil, [31], [93], [110], [200], [214], [218], [223]