J. Vollmer, a German who had worked in Sweden, cam and designed a wheel-on-track tank the KH50 at Skoda in 1925 with Tetra. In 1928-29 this let to the KH60 and in 1930 the KH70. The wheel-on-track designs were abandoned in 1934.
Czechoslovakia obtained samples of the Vickers Carden-Loyd tankettes from Vickers-Armstrongs. CKD/Praga developed a similar vehicle named the T33 (P-I). It wasn't liked by its users but were still produced for the army. Skoda produced a similar vehicle, the S-I, that was more powerful but it wasn't adopted and the contract had already been awarded to CKD. The Skoda model was sent to Yugoslavia for evaluation. The Yugoslavians decided that the model should have a 47 mm gun. This was designated the S-Id.
In 1933 CKD began designing a light tank (TNHB) for export called the LT-34 (P-II). It was 7.5 tons with a 37 mm gun. It was accepted by the Czechoslovakian Army.
World War II Vehicles
Skoda in 1935 introduced their S-IIa/T.II and it was 8 tons with a 37 mm gun. CKD became a co-contractor with Skoda and this became the LT35. The LT35 was the army's most numerous tank.
In October 1937 the Czech Defense Department formed a tank evaluation committee to test all Czech tank designs. A tank testing center was established outside of the CKD factory in January 1938. Two other firms (Skoda and Adamov) submitted vehicles for testing. CKD's TNHS model passed the tests by going 3,000 miles and 1,000 of those cross country without any major mechanical problems. An order for 150 was placed.
Air Force in 1938
There were 1,514 aircraft in the Czechoslovakian air force in September 1938. Of those 566 were available for combat.
On March 15, 1939, Germany occupied Czechoslovakia. Existing stocks of tanks and airplanes were taken over. There were about 300 LT-35s confiscated and used in the German Heer (army) as the PzKpfw 38(t).
Many of the pilots in the Czechoslovakian air force escaped to Britain and France.