20-501-21 vs 20-501-30WR vs 20-501-30

 
PartNumber20-501-2120-501-30WR20-501-30
DescriptionIC & Component Sockets WIRE WRAP BIFURCATED 20 PINS GOLDIC & Component Sockets WIRE WRAP BIFURCATED 20 PINS TINIC & Component Sockets WIRE WRAP BIFURCATED 20 PINS TIN
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