Scientific Columbus. Type SC10.
Ser. No 0008511. Model 6374 , Kh=0.6 wh at SA, 120 V, 60 Hz.

Scientific Columbus. Type SC10V.
Ser. No 51678. Model 6374V , Kh=0.6 wh at SA, 120 V, 60 Hz.

G & W Electric Co.
Cat No. VRA21-376M-40PI.
Serial No. 625-97-0362.

Sangamo. 120/240/480 V. 1-5-12.5-50A 50/60 Hz. Basic Kh 0.6 (SA 120V) Cat # 9092000-000 Serial # 8848006

Basic Measuring Instruments
Ser # 35227