CREATE TABLE "table1_30011_2" (
  "prefix_class" text,
  "type_and_usage" text,
  "example" text,
  "equivalent" text,
  "reference" text
);

Question: What is every reference for type and usage of Germanium small-signal RF transistor?
SQL: SELECT "reference" FROM "table1_30011_2" WHERE "type_and_usage"='Germanium small-signal RF transistor';

Question: What is every equivalent for the example of asy28?
SQL: SELECT "equivalent" FROM "table1_30011_2" WHERE "example"='ASY28';

Question: What is every reference for the example of AF117?
SQL: SELECT "reference" FROM "table1_30011_2" WHERE "example"='AF117';

Question: What is every prefix class for the equivalent of NTE160?
SQL: SELECT "prefix_class" FROM "table1_30011_2" WHERE "equivalent"='NTE160';

Question: What is every prefix class for the equivalent of NTE101?
SQL: SELECT "prefix_class" FROM "table1_30011_2" WHERE "equivalent"='NTE101';

Question: What is every example for the equivalent of NTE160?
SQL: SELECT "example" FROM "table1_30011_2" WHERE "equivalent"='NTE160';