子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 121 | heat economizer | US1717715D | US1717715A | 1929-06-18 | ||
| 122 | Furnace | US12062726 | 1926-07-06 | US1712260A | 1929-05-07 | DYBVIG OLAF N |
| 123 | Furnace construction | US13157826 | 1926-08-26 | US1708690A | 1929-04-09 | BREESE JR JAMES L |
| 124 | Expansion means for furnaces | US27303128 | 1928-04-26 | US1692576A | 1928-11-20 | ROTE MORGAN M |
| 125 | Heater construction | US22053227 | 1927-09-19 | US1690533A | 1928-11-06 | EFRAMSON CARL F |
| 126 | Heating apparatus | US11645226 | 1926-06-16 | US1658367A | 1928-02-07 | BOLLINGER WILLIAM A |
| 127 | Furnace | US20787927 | 1927-07-23 | US1650749A | 1927-11-29 | HENRY TIELKEMEYER |
| 128 | Dirk meyer | US1641825D | US1641825A | 1927-09-06 | ||
| 129 | Nesota | US1632000D | US1632000A | 1927-06-14 | ||
| 130 | Heating furnace | US6867525 | 1925-11-12 | US1612115A | 1926-12-28 | JOHN HERMANS |
| 131 | Hot-air furnace | US11706026 | 1926-06-19 | US1609788A | 1926-12-07 | ANDERSON OSCAR W |
| 132 | Furnace | US6402825 | 1925-10-21 | US1609213A | 1926-11-30 | SMITH SILAS E |
| 133 | Hot-air furnace | US6979725 | 1925-11-18 | US1601861A | 1926-10-05 | LANG WILLIAM C |
| 134 | Furnace | US74476224 | 1924-10-20 | US1592694A | 1926-07-13 | ANDREW HALLUM |
| 135 | Hot-air heater | US55769922 | 1922-05-01 | US1557118A | 1925-10-13 | TOLLAND JOHN W |
| 136 | Air-heating furnace | US61248623 | 1923-01-13 | US1547534A | 1925-07-28 | TURNER PERRY B |
| 137 | Pipeless furnace | US60366322 | 1922-11-27 | US1520900A | 1924-12-30 | WHITZEL DAMAN LOUIS |
| 138 | Heating furnace | US62765423 | 1923-03-26 | US1462018A | 1923-07-17 | MASON HENRY W |
| 139 | Hot air furnace | US56067522 | 1922-05-13 | US1449712A | 1923-03-27 | WELCH FRANK M; THEODORE PRESCOTT |
| 140 | Furnace | US51365521 | 1921-11-08 | US1440071A | 1922-12-26 | GABRIEL ALBERT A |
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