Likely origin
Half-Life 1998-11-19
Sources
Textures, by WAD
halflife.wad · 84
+0medkit+0~fifties_lgt2+0~fifts_lght3+0~fifts_lght5+0~generic86r+0~light4a+0~metalstch2+0~tnnl_lgt4+a~fifts_lght3+a~generic65-0c2a4_cor2-0fifties_w12-0fifties_w12b-0genpipe1-0out_c3b-0silo2_c1-0silo2_p2-0silo2_p2b-0silo2_p3-0silo2_p4-0silo2_pan2babtech_ceil01babtech_ceil03babtech_dr1cbasetrim01bcrate26c1a3floor02c1a4b_w3c2a3turbine2c2a3turbine4c2a4_conv1c2a4_conv2c2a4b_sign1c3a1_w3bcardbox1cardbox4cardboxbot1cardboxtop1crete2_flr03ccrete2_wall01crete4_flr02ddrkmtlt_bord11duct_flr02fifties_dr1fifties_dsk1fifties_dsk5afifties_dsk5bfifties_dsk5dxgeneric009generic015hgeneric76lab1_brd3clab1_brd3glab1_comp9elab1_panelhlab1_swch2medkitedge1out_box2out_box2bout_box2dout_w8dr1out_wall2cpfab_trsh1apfab_trsh1bpfab_trsh1cpfab_trsh1dscroll_conv3sign3sign58sign73bsign74sign81silo2_brd1asilo2_brd1bsilo2_c1csilo2_gad2silo2_pan6stain_wall05stain_wall06tnnl_brd1tnnl_brd1btnnl_swr1tnnl_swr2{grate4a