| Number | Name | Date | Kind |
|---|---|---|---|
| 187221 | Laub et al. | Feb 1960 | |
| 196511 | Kostanecki | Oct 1963 | |
| 200468 | Graser et al. | Mar 1965 | |
| 218439 | Horowitz et al. | Aug 1970 | |
| D218536 | Levow | Aug 1970 | |
| 229355 | Rausch | Nov 1973 | |
| 233139 | McMaster | Oct 1974 | |
| 236445 | Danz et al. | Aug 1975 | |
| 249248 | Gibbs | Sep 1978 | |
| 249249 | Gibbs | Sep 1978 | |
| 249891 | Rowland et al. | Oct 1978 | |
| 249945 | Freijd | Oct 1978 | |
| 251485 | Stockdale | Apr 1979 | |
| D254185 | Doodson | Feb 1980 | |
| D271486 | Doodson | Nov 1983 | |
| 3643244 | Levy | Feb 1972 | |
| 3771164 | Bolick | Nov 1973 |
| Entry |
|---|
| W. Bell & Co., 1981 Catalog, p. 276, Items "F" & "J", Bearcats 220 & 160. |
| American District Telegraph Co., Technical Bulletin "Daytime Annunciator Security System", (May 1980). |
| Arrowhead Enterprises Inc., Brochure for Series S4400, "2 to 14 Zone Control Instrument", (copyright 1978). |
| Electrical Consultant, (May/Jun. 1977), p. 6. |
| Electrical Consultant, (May/Jun. 1978), p. 27. |
| Electrical Consultant, (Mar./Apr. 1978), p. 40. |