4TP (LT-1, Poland). Crew 2 people.

In 1935. it was decided to create new light tanks for the Polish army. Works were conducted at the Państwowe Zakłady Inżynieryjne (PZInż) enterprise under the supervision of the engineer E. Habih. The creation of the car was strongly influenced by foreign developments, and an example was the British four-ton Vickers Carden Loyd Commercial Light Tank. In December 1936. the documentation was ready, on the basis of which the creation of the prototype of the PZInż.140 tank began. From the autumn of 1937. to May 1939. the tests of the tank were carried out, but it did not go to serial production.

10TP (LT-3, Poland). Continues the trend of TP in the family. Crew of 4 people. 
Project of the wheel-tracked tank cruiser of the late 1930s. The project was based on the Christie tank. The prototype of the machine was successfully tested in 1938-39, but with the beginning of the Second World War the work on the tank was stopped and the prototype was destroyed. 

7TP was the development of the British tank Vickers Mk.E, produced in Poland under license. The machine was different from the original with a more powerful diesel engine. 235 (Saurer VBLDb), a turret and weapons. The first series of machines was made in a two-turret version. In 1935, an agreement was concluded with the Swedish firm Bofors to manufacture a turret with cannon armament of the same firm for installation on a single-turret version of the tank. The first prototype of the single-turret tank 7TP was tested in February 1937. After that, mass production began, and until September 1939, 110 single-turret 7TPs were produced.