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A microfilter: arrangement of wires in a filar position-Micrometre, the type in general use in the late 19th century
ARP23A16_143

A microfilter: arrangement of wires in a filar pos...

A microfilter: filar position-Micrometre, the type in general use in the late 19th century
ARP23A16_142

A microfilter: filar position-Micrometre, the type...

A microfilter: filar position-Micrometre, the type in general use in the late 19th century
ARP23A16_144

A microfilter: filar position-Micrometre, the type...