SUMMING
| Code | Name | Earliest evidence | Confidence | Files |
|---|---|---|---|---|
| M166 | Active Summing Module | 1970|3 | high | 22 |
| M463 | Submaster Module | 1972|5 | high | 96 |
| M463A | Submaster Module | 1972|5 | family | 12 |
| M463AB | Submaster Module | 1986|19 | high | 38 |
| M463AC | Master Module | 1986|19 | high | 36 |
| M463B | 1974|7 | high | 7 | |
| M463J | Submaster Module | 1972|5 | family | 34 |
| M463K | Submaster Module | 1974|7 | high | 66 |
| M463L | Submaster Module | 1974|7 | high | 80 |
| M463LA | Submaster Module | 1974|7 | high | 73 |
| M473 | Submaster Module | 1984|17 | medium | 57 |
| M473A | Submaster Module | 1977|10 | high | 43 |
| M473B | Stereo Submaster | 1984|17 | high | 14 |
| M477 | Master Module | 1979|12 | high | 75 |
| M479 | Dual Auxiliary Module | 1978|11 | high | 91 |
| M484 | Dual Summing Amplifer | 1975|8 | high | 24 |
| M487 | Dual Master Module | 1982|15 | high | 64 |
| M497 | Dual-Master-Module | 1978|11 | high | 42 |
| M497A | Dual Master Module | 1978|11 | high | 57 |
| M497B | Dual Master Module | 1983|16 | high | 31 |
| M497C | Dual Master Module | 1978|11 | family | 56 |
| M497D | Dual Master Module | 1978|11 | family | 31 |
| M523 | Stereo Submaster Module | 1985|18 | high | 88 |
| M527 | Master Module | 1985|18 | low (named by) | 62 |
| M528 | Dual Auxiliary Module | 1988|21 | low (in use by) | 57 |