| 1931 BROMSREGULATOR Automatic Slack Adjuster Brakes |
| 1958 CONTINENTAL Automatic Slack Adjuster Art |
| 1961 SYMINGTON WAYNE CORP Automatic Slack Adjuster |
| 1957 DOREY Operating Mechanism Automatic Slack Adjuster |
| 1932 GUSTIN BACON CO Automatic Slack Adjuster |
| 1961 WESTINGHOUSE AIR BRAKE CO Automatic Slack Adjuster |
| 1939 KERSHAW Automatic Slack Adjuster Patent |
| 1934 BROMSREGULATOR Automatic Slack Adjuster Brakes |
| 1934 CAMP Automatic Slack Adjuster Patent Print |
| 1959 AMERICAN Automatic Brake Slack Adjuster Art |
| 1961 HOWARD Automatic Slack Adjuster Patent |
| 1934 ANDERSON Automatic Slack Adjuster Patent |
| 1959 VAUGHT Automatic Brake Slack Adjuster Art |
| 1932 UNIVERSAL Automatic Slack Adjuster Art |
| 1958 HENRY Automatic Slack Adjuster Brakes Art |
| 1937 HEWITT Automatic Slack Adjuster Patent |
| 1934 HENRY Automatic Slack Adjuster Brakes Art |
| 1937 MOODY Automatic Slack Adjuster Patent Print |
| 1936 HENRY Automatic Slack Adjuster Patent Print |
| 1960 BLATTNER Automatic Hydraulic Slack Adjuster |
| 1956 CONTINENTAL Automatic Slack Adjuster Art |
| 1937 AMERICAN BRAKE CO Automatic Slack Adjuster |
| 1932 ANDERSON Automatic Slack Adjuster Patent |
| 1922 KONRAD Automatic Slack Adjuster Brakes Art |
| 1936 HANS Automatic Slack Adjuster Patent Print |
| 1932 CAMP Automatic Slack Adjuster Patent Print |
| 1934 UNIVERSAL Automatic Slack Adjuster Art |
| 1925 DE Automatic Slack Adjuster Air Brakes Art |
| 1920 OHIO BRASS CO Automatic Slack Adjuster Art |
| 1958 BROMSREGULATOR Automatic Slack Adjuster Brakes |
| 1956 DOREY Automatic Slack Adjuster Patent Print |
| 1950 HJALMAR Automatic Slack Adjuster Brakes Art |
| 1961 MCCLURE Automatic Slack Adjuster Patent |
| 1958 DOREY Automatic Slack Adjuster Patent Print |
| 1938 SCHWENTLER Automatic Slack Adjuster Patent |
| 1933 CAMP Automatic Slack Adjuster Patent Print |
| 1943 HENRY Automatic Slack Adjuster Brakes Art |
| 1939 WESTINGHOUSE BRAKE SIGNAL Automatic Slack Adjuster |
| 1933 BROMSREGULATOR SVENSKA AB Automatic Slack Adjuster |
| 1956 BROMSREGULATOR SVENSKA AB Automatic Slack Adjuster |
| 1920 HUNZICKER Automatic Slack Adjuster Patent |
| 1950 BROMSREGULATOR Automatic Slack Adjuster Brakes |
| 1943 BROMSREGULATOR Automatic Slack Adjuster Brakes |
| 1933 HENRY Automatic Slack Adjuster Patent Print |
| 1937 WESTINGHOUSE AIR BRAKE CO Automatic Slack Adjuster |
| 1931 HENRY Automatic Slack Adjuster Brakes Art |
| 1937 WILLIAMSON Automatic Slack Adjuster Patent |
| 1933 UNIVERSAL Automatic Slack Adjuster Art |
| 1936 BROMSREGULATOR SVENSKA AB Automatic Slack Adjuster |
| 1934 GRIP NUT CORP Automatic Slack Adjuster Art |
| 1960 SYMINGTON Automatic Hydraulic Slack Adjuster |
| 1957 SCHULZ Automatic Screw Type Slack Adjuster |
| 1938 AMERICAN BRAKE CO Automatic Slack Adjuster |
| 1957 SYMINGTON Automatic Screw Type Slack Adjuster |
| 1956 HENRY Automatic Slack Adjuster Patent Print |