▁for ▁the ▁A TF ▁Types etter ▁was ▁a ▁version ▁of ▁B ask er ville ▁by ▁Tommy ▁Thompson . ▁The ▁last ▁and ▁most ▁advanced ▁model ▁based ▁on ▁the ▁Frid en ▁mechanism ▁was ▁the ▁" B - 8 ", ▁where ▁an ▁ 1 8 - increment ▁system , ▁was ▁achieved ▁by ▁means ▁of ▁a ▁series ▁of ▁electro - me chan ical ▁rel ays ▁that ▁could ▁add ▁one ▁or ▁two ▁incre ments ▁which ▁were ▁one - third ▁of ▁a ▁unit ▁to ▁selected ▁characters , ▁without ▁changing ▁the ▁basic ▁mechanical ▁escape ▁mechanism ▁of ▁the ▁model ▁" B ", ▁except ▁that ▁it ▁was ▁scale d ▁back ▁to ▁six ▁units . ▁This ▁achieved ▁an ▁ 1 8 - unit ▁system ▁like ▁that ▁of ▁the ▁Mon ot ype , ▁but ▁a ▁single ▁unit ▁was ▁called ▁an ▁" increment ", ▁while ▁a ▁group ▁of ▁three ▁units ▁was ▁called ▁a ▁" unit " ▁because ▁those ▁were ▁the ▁units ▁de alt ▁with ▁in ▁the ▁Just ow riter ▁mechanism ▁which ▁previous ▁models ▁of ▁the ▁A TF ▁Types etter ▁used ▁exclus ively . ▁ ▁A TF ▁also ▁was ▁the ▁author ized ▁sales ▁agent ▁in ▁the ▁United ▁States ▁and ▁several ▁other ▁countries ▁for ▁another ▁film ▁setting ▁machine , ▁the ▁H ade go , ▁which ▁was ▁a ▁head lin er , ▁manufact ured ▁in ▁the ▁Netherlands ▁from ▁ 1 9 5 1 , ▁under ▁license ▁from ▁its ▁invent or , ▁Hans ▁de ▁Go e ij . ▁ ▁The ▁last ▁phot ot ypes etter ▁designed ▁and ▁produced ▁by ▁A TF ▁was ▁the ▁Ph oto comp ▁ 2 0