Series 1640 Floating Contact Null Switch for High and Low Actuation Visual Set Point Adjustment...Adjustable Null Zone The unique electric switch design in the 1640 is another Dwyer Instruments, Inc. innovation. The Dwyer Model 1640 Differential Pressure Switch resembles the Series 1630 switches described on the previous page.
--Vintage Bud Radio Inc. CU-3003-A Combination Snap or Screw Type Minibox--4"L x 2 1/4"W x 2 1/4"H, Aluminum Natural Finish--Unused in original box--Great condition, included original hardware-4 screws, punch and instructions--Box good condition but with some writing on it--Bonus qty.
FOUR VINTAGE DRAKE TYPE 300 BLACK LAMP HOLDER FOR SCREW TYPE LAMPS WITH 3 0R 6 WATT, 120 VOLT LAMPS INSTALLED AND MOUNTING BRACKETS, USED. I found these lamp holders about 30 years ago when cleaning out a scientific laboratory. I kept them thinking to use them in electronic projects.
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