|Manufacturer||Walker Hall Sears|
|Serial number||NMI-28"NMI" can not be assigned to a declared number type with value -28.|
- 28, #29 & #30. Same basic units except that #30 is brass. Each top is stamped with the HALL-SEARS logo (Chevron around the letters H/S). Caps contain molded rubber packing glands with integral press-on contacts - no solder contacts. Each unit is stamped around the side in the same manner; 404409 20 U9 (#28), 134326 18 T7 (#29) with only 18-2 visible beneath the brass cap on #30. #29 has a bright red anodized cap and has been painted yellow.