- 8 Large Measuring Instruments, c. 1900-20...
- 2 Resistance Bridges and 2 Laboratory Devices...
- 6 Galvanometers, c. 1900...
- 4 Measuring Bridges, c. 1920...
- 5 Large Precision Measuring Instruments, c. 1...
- 7 Measuring Instruments, c. 1900-20...
- 4 Large Precision Measuring Instruments, c. 1...
- 4 Large Brass Precision Measuring Instruments...
- 2 Siemens & Halske Precision Instruments...
- 3 Measuring Instruments...