Weston Patents related to the 155 AC Voltmeter

USPO 531669, 1895 — Indicator for Eletric Currents

(click images to enlarge)

USPO D28392, 1898 — Design
for an Index Needle or Hand

USPO D28393, 1898 — Design
for an Index Needle or Hand

USPO 611722, 1898 — Electrical Measuring Instrument

USPO 611723, 1898 — Index Needle or Hand for Electrical Measuring Instruments