For sale is reprint of National HRO, HRO-5, HRO-5T, HRO-5R HRO-M, HRO-MX, HRO-M-RR, HRO-M-TM, HRO-SR and HRO-JR Communication Receiver manual. Manual is 35 Pages long.
Manual covers 10 versions of HRO family or receivers. Includes diagrams, circuit diagrams and part lists. Manual is WW2 vintage, pages seem to be typed on a typewriter, no fancy fonts like on pre or post-war manuals here.