Clark standard cell no. 1297 by Nalder Brothers and Co.

Telecommunications

Weston standard cell type D-402-A

Telecommunications

1950

NCS copy standard resistance

Telecommunications

1905

Pair of Clark standard cells in one case

Telecommunications

Standard of mutual inductance

Telecommunications

NCS standard resistance

Telecommunications

1920

NCS copy standard resistance

Telecommunications

1905

Standard resistor no. 4644

Telecommunications

Profs. Ayrton and Perry standard inductance

Telecommunications

1/3 microfarad standard condenser

Telecommunications

1892

Pair of Clark standard cells in one case

Telecommunications

Standard air capacitor

Telecommunications

Standard condenser no. 30510

Telecommunications

No. 3 standard air condenser

Telecommunications

1988

Clark standard element (cell) no. 142

Telecommunications

1872

Clark standard cell

Telecommunications

Clark standard cell type D400-A

Telecommunications

NCS copy standard resistance

Telecommunications

1905