Number | Date | Country | Kind |
---|---|---|---|
2711826 | Mar 1977 | DEX | |
2740374 | Sep 1977 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2813312 | Loue et al. | Nov 1957 | |
3052930 | Mathews | Sep 1962 | |
3281993 | Riegelman | Nov 1966 | |
3384998 | Abramson | May 1968 | |
3942197 | Sudmann et al. | Mar 1976 | |
4014070 | Rifkin | Mar 1977 | |
4073035 | Baus | Feb 1978 |
Number | Date | Country |
---|---|---|
2634744 | Dec 1977 | DEX |
617407 | Feb 1949 | GBX |
Entry |
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"Sliding Steel Sash", The Architectural Forum, p. 210, Mar. 1939. |