what model is listed first in the table?
rtd-1/vdr-2
col : model name | date | type | thrust (kg) / power (eshp) | fitted to row 1 : rtd-1/vdr-2 | 1938 | two-stage centrifugal compressor turbojet | 500 kg estimated | test-bed only row 2 : s-18/vdr-3 | 1945 | axial flow compressor turbojet | 1,250 kg | gu-vrd project row 3 : tr-1 | 1946 | 8-stage axial flow compressor turbojet | 1,300 kg | alekseyev i-21, ilyushin il-22, su row 4 : tr-1a | 1947 | 8-stage axial flow compressor turbojet | 1,500 kg |  row 5 : tr-2 | 1947 |  |  | projected growth version of tr-1 row 6 : tr-3 and al-5 | 1949 | 7-stage axial-flow turbojet | 4,600 kg (at qualification in 1950) | il-30, il-46, lavochkin aircraft 190 row 7 : tr-7 | 1950s | supersonic compressor prototype of the al-7 |  | prototype for al-7 row 8 : al-7 | 1954 | 9-stage supersonic compressor turbojet | 6,500 kg | il-54, su-7b, tu-98, su row 9 : al-21 | 1961 | 14-stage axial compressor with variable stator blades | 11,000 kg | yak-38, tu-28/tu-128, su-17 row 10 : al-31 | 1976 | twin-spool turbofan 0.6 bypass ratio. | 13,300 kg | su-27, su-30, su-34, su-35,
what model is listed first in the table?
Model name Date Type Thrust (kg) / Power (eshp) Fitted to
RTD-1/VDR-2 1938 Two-stage centrifugal compressor Turbojet 500 kg estimated Test-bed only
S-18/VDR-3 1945 Axial flow compressor Turbojet 1,250 kg Gu-VRD project
TR-1 1946 8-stage Axial flow compressor Turbojet 1,300 kg Alekseyev I-21, Ilyushin Il-22, Sukhoi Su-10, Sukhoi Su-11
TR-1A 1947 8-stage Axial flow compressor Turbojet 1,500 kg
TR-2 1947 projected growth version of TR-1
TR-3 and AL-5 1949 7-stage Axial-flow Turbojet 4,600 kg (at qualification in 1950) Il-30, Il-46, Lavochkin Aircraft 190, Tu-86, Yak-1000, Su-17(1949), "Aircraft 150"
TR-7 1950s supersonic compressor prototype of the AL-7 Prototype for AL-7
AL-7 1954 9-stage supersonic compressor Turbojet 6,500 kg Il-54, Su-7B, Tu-98, Su
AL-21 1961 14-stage Axial compressor with variable stator blades 11,000 kg Yak-38, Tu-28/Tu-128, Su-17, Su-24
AL-31 1976 Twin-spool Turbofan 0.6 bypass ratio. 13,300 kg Su-27, Su-30, Su-34, Su-35, Su-47 Berkut
RTD-1/VDR-2