Also known as "Mask Aligner" stepper, steppers
thumb|250px|An Mercury-vapor lamp#Emission line spectrum|i-line stepper at [[Cornell NanoScale Science and Technology Facility. (Photo taken under inactinic light.)]]
Also known as "Mask Aligner" stepper, steppers
thumb|250px|An Mercury-vapor lamp#Emission line spectrum|i-line stepper at [[Cornell NanoScale Science and Technology Facility. (Photo taken under inactinic light.)]]