I believe if I am not mistaken that the Lehi Zionist terrorist group may have been the first group to engineer car bombs: certainly the first in the Middle East. This is from a previous post of mine:
Who Started Terrorism in the Arab-Israeli Conflict?
Bombs in Cafes: first used by Zionists in Palestine on March 17th, 1937 in Jaffa.
Bombs on Buses: first used by Zionists in Palestine Aug. 20th-Sep. 26, 1937.
Bombs in Market Places: first used by Zionists on July 6th, 1938 in Haifa.
Bombing of Hotels: first used by Zionists on July 22nd, 1946 in Jerusalem.
Bombing of Foreign Embassies: first used by Zionists on October 1st, 1946 in Rome (against the British).
Mining of Ambulances: First used by Zionists on October 31st, 1946 in Petah Tikvah.
Letter Bombs: first used by Zionists in June 1947 against British targets in UK.
(for documentation, consult The Arab Women's Information Committee and The Institute for Palestine Studies, Who Are the Terrorists? Aspects of Zionist and Israeli Terrorism, (Beirut: Insitute for Palestine Studies, 1972).
Who Started Terrorism in the Arab-Israeli Conflict?
Bombs in Cafes: first used by Zionists in Palestine on March 17th, 1937 in Jaffa.
Bombs on Buses: first used by Zionists in Palestine Aug. 20th-Sep. 26, 1937.
Bombs in Market Places: first used by Zionists on July 6th, 1938 in Haifa.
Bombing of Hotels: first used by Zionists on July 22nd, 1946 in Jerusalem.
Bombing of Foreign Embassies: first used by Zionists on October 1st, 1946 in Rome (against the British).
Mining of Ambulances: First used by Zionists on October 31st, 1946 in Petah Tikvah.
Letter Bombs: first used by Zionists in June 1947 against British targets in UK.
(for documentation, consult The Arab Women's Information Committee and The Institute for Palestine Studies, Who Are the Terrorists? Aspects of Zionist and Israeli Terrorism, (Beirut: Insitute for Palestine Studies, 1972).