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Roof truss callout

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I have a set of plans form the 1970s that call out the gable roof trusses as "14-6 6-14 TJL ROOF TRUSS @ 2'-8" OC".  The upper surface is approximately a 4:12 pitch.  Also, the plans show glulam beams 5-1/8 x 18 that apparently support the trusses.  The ceiling is a hard lid and there is no attic space.  Any idea of what these trusses are?  It appears that the glulam beams have been pushed up and that these trusses are top-chord bearing.