I compared the type description of an INTj on socionics.com with the Reinin dichotomies. All of them can be found in the description (including the "uncovered" one):
Obstinate. Interest-protecting...When defending their concepts and ideas during a confrontation their logic can become solid and absolute.
Static. Dynamic types try to explain more...They cut out all irrelevant details that may cloud the argument.
Merry, even though Fe is weak...Although the first impression of INTjs is that they are emotionless, when they become inspired during conversation an emotionality previously unseen begins to emerge. Their eyes start flashing with a fanatic light and their passion increases as the conversation progresses.
Asking. Declaring types rather talk themselves...INTjs always give others a chance to say what they need to say.
Democratic. Aristocratic types may believe other people don't have talents...They consider that everyone has got talents and they try at least not to interfere.
Judicious. Decisive types sometimes make decisions without having any idea...They do not refuse any proposals immediately, preferring to examine them first.
Farsighted. They rely on their experience, their own opinions...INTjs usually have an interest that stays with them for a long time and are absolutely indifferent to what others say about it.
Negativist. Positivists are rather happy with what they have...They never endorse their position in life.
Result, they produce crazy ideas all the time. Process types do everything step by step...In fact INTjs are so weird that they do not just appear weird to people who don't know them, but to other INTjs as well.
Emotivist. They want to understand the true emotional state of others...It works on the principle that an angry person has very little control over their emotions and therefore cannot suppress their true feelings, which often keeps the truth from coming out. INTjs normally do not apply this principle to anybody unless they are unsure.
Strategic. They focus on goals all the time...For instance, if you ask an INTj to design a good chair to withstand the weight of one adult, when it is finished it would probably withstand the weight of one adult elephant