MIL-S-19500/388 Complete Document History
Semiconductor Device, Transistor, PN, Silicon, Unijunction Types 2N4947, 2N4948 and 2N4949 JAN, JANTX, JANTX , and JANS

Complete Current Edition:
   REVISION B - SEMICONDUCTOR DEVICE, TRANSIST - June 30, 1992
   GROUP INACTIVATION 1 - GR INACTIVATION NOT 1, REV B - June 7, 1999
   REV B VALIDATION 2 - VALIDATION NOTICE 2, REV B - March 24, 2004
   REV B VALIDATION 3 - VALIDATION NOTICE 3, REV B - July 8, 2011
   REV B VALIDATION 4 - VALIDATION NOTICE 4 FOR REVISION B - May 5, 2017

Obsolete Revision Information:
   REVISION A - SEMICONDUCTOR DEVICE, TRANSIST - July 11, 1983