Mark's Auto Lockout Services
| IBM | reset switch | 1043B, 1054UN |
| Ideal | O1122, O1122A, O1122B, 1043B | |
| Ideal Security | ID1, 1041T, 1041E, 997E, 1022, 1179, O1122A, 1092B |
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| Ilco | night latch | 1054FN, 1054DL, 1054MT |
| Indiana | office furniture | 1069N, O1122, 1096EN |
| International Harvester | Trovill RVs | P1098A, 1970AM, H1098X |
| International | trucks | 1098M, 1970AM |
| International Harvester | 1970AM | |
| International Products | 1011 | |
| Invincible | 1041T | |
| Iseo | 1099, 1016 |