When nd 2 fe 14 b (bonded) is the magnet how many measurements of tc (°c)?
CREATE TABLE "magnetic_properties" (
  "magnet" text,
  "b_r_t" text,
  "h_ci_k_a_m" text,
  "bh_max_k_j_m_3" text,
  "t_c_c" text
);
SELECT COUNT("t_c_c") FROM "magnetic_properties" WHERE "magnet"='Nd 2 Fe 14 B (bonded)';