Uhm... No. Not then and not today.
You’re probably thinking of tractors and harvesters.
The text below says, roughly: "Let's fight for the betterment of socialistic Polish villages".
Sometimes I don't know if feminists are really serious or just trollin'...
You're right of course in that it's hard to see a woman on a tractor, but what I'm saying is that 50 years of propaganda can't pass without any consequences, even if it was widely recognized as a propaganda and it was actively opposed by many. I think that these efforts actually did something for women, even if only a little. They - the communists - even did something for racial equality: they offered stipends for people from African countries (of course those aligned with communists only) and it was quite normal (I'm being told, please don't blame if that's wrong!) to see a man or a woman with different skin color in the university.
Anyway, while communists did many bad things, they at least sometimes tried to do something good. Someone better educated than me should say how those efforts fared - I suppose they were not that successful, because as you said, it's really hard to find a woman on a tractor :) - but it's worth noting, I think, that they were made.
Well, this was slightly sarcastic. I wouldn't hang this picture on my wall, but it was clearly intended to look good like all the other pictures showing people happily running around with hammers or sickles and building better socialist future :)
As for whether encouraging women to pick up technical or scientific jobs (when it works) does any good, I'm not sure. I'm under impression that lower number of women in IT and CS is mostly caused by the female part of "I've no idea what I'm doing, I kinda landed here by accident" crowd going somewhere else. Those who are serious get through regardless of sex and the rest, well, isn't serious.
Not a tractor, but my aunt was operating an industrial crane in the '80s in communist Romania.
From a business perspective, I have to wonder how the U.S. economy withstood the end of the war. The troops returned, flooding the market with labor and at the same time, much of what was produced during the war had no market in peace-time.
At the same time 99% of the party leaders, managers, directors etc were male, even at regional level. There were still trades where woman were rare (woman on tractor was rare, casue not many woman wanted to do that for a living, woman as a bank director were rare just because). But no problems with getting to the university (incidentaly - you had much better chance to get to university if you were child of industrial worker of farmer, than if your parents were "inteligencja").
Stereotypes about math, programming and gender are also different between countries. Being good at math is cool in Poland, for example, even in primary school. There are some stereotypes about woman similar to that in USA, but nothing on such scale. From my experience around 10% programmers are female here.