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Post Office Box
 
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Post Office  Box Manufacturers

Post Office Box

Education Quality, Brass Block, Plug Type, having 3 pairs of ratio coils, 10, 100, 1000 ohms and 16 series coil constant wire. All Plugs are interchangeable with accuracy 0.1%.
 
Catalogue No.
Description
Enquiry
686 A
With 3 ratio coils.
686 B
With 4 ratio coils.
 

Post Office Box Manufacturers

Post Office Box

Constant Coil standard Teak Box. ½” Block
 
Catalogue No.
Description
Enquiry
687 A
With 3 ratio coils
687 B
With 4 ratio coils
 

Post Office Box Manufacturers

Post Office Box

Same as above but with Manganian Coils. ½” Blocks.
 
Catalogue No.
Description
Enquiry
688 A
With 3 ratio coils.
688 B
With 4 ratio coils.
 

Post Office Box Manufacturers

Post Office Box

Standard Quality, Most Superior Brass Block 9/16” Manganian Coils.
 
Catalogue No.
Description
Enquiry
689 A
With 3 ratio coils.
689 B
With 4 ratio coils.
 

Post Office Box Dial Type Manufacturers

Post Office Box Dial Type

 
Catalogue No.
Description
Enquiry
690
Constant Coils, 6 dials each consisting of 10 steps provided with four ratios of 1, 10, 100, 1000 ohms, and 2 ratios dials.
 
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