| SC 13D/A | 2005-06-17 | FIRST ALBANY COMPANIES INC | MECHANICAL TECHNOLOGY INC | 2,231,040 | 7.3% | EDGAR |
| SC 13D/A | 2005-05-31 | FIRST ALBANY COMPANIES INC | MECHANICAL TECHNOLOGY INC | 2,576,040 | 8.4% | EDGAR |
| SC 13G | 2005-02-14 | FLETCHER ASSET MANAGEMENT INC | MECHANICAL TECHNOLOGY INC | 1,617,278 | 5.3% | EDGAR |
| SC 13D/A | 2003-08-20 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 6,073,227 | 10.0% | EDGAR |
| SC 13D/A | 2003-07-22 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 6,973,227 | - | EDGAR |
| SC 13D/A | 2003-03-24 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 7,593,227 | - | EDGAR |
| SC 13D/A | 2003-01-03 | FIRST ALBANY COMPANIES INC | MECHANICAL TECHNOLOGY INC | 2,991,040 | 10.8% | EDGAR |
| SC 13G/A | 2003-01-02 | MECHANICAL TECHNOLOGY INC | BEACON POWER CORP | - | 0.0% | EDGAR |
| SC 13D/A | 2002-12-26 | FIRST ALBANY COMPANIES INC | MECHANICAL TECHNOLOGY INC | 3,091,040 | 11.2% | EDGAR |
| SC 13D/A | 2002-12-24 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 8,108,227 | - | EDGAR |
| SC 13D/A | 2002-11-14 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 10,891,315 | - | EDGAR |
| SC 13D/A | 2002-07-10 | FIRST ALBANY COMPANIES INC | MECHANICAL TECHNOLOGY INC | 11,203,115 | 31.5% | EDGAR |
| SC 13D/A | 2002-05-15 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 11,420,515 | - | EDGAR |
| SC 13G/A | 2002-02-11 | MECHANICAL TECHNOLOGY INC | BEACON POWER CORP | 4,410,797 | 10.3% | EDGAR |
| SC 13D/A | 2001-10-05 | MECHANICAL TECHNOLOGY INC | SATCON TECHNOLOGY CORP | 1,400,000 | - | EDGAR |
| SC 13D/A | 2001-06-12 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 12,058,890 | - | EDGAR |
| SC 13D/A | 2001-05-16 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 12,569,315 | - | EDGAR |
| SC 13D/A | 2001-04-10 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 13,151,815 | - | EDGAR |
| SC 13G | 2001-02-14 | MECHANICAL TECHNOLOGY INC | BEACON POWER CORP | 3,866,649 | 9.2% | EDGAR |
| SC 13D/A | 2001-02-09 | MECHANICAL TECHNOLOGY INC | PLUG POWER INC | 13,707,015 | - | EDGAR |