| Patents for B25B 21 - Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose (7,850) |
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| 03/21/1978 | US4079640 Pipe make up device |
| 03/14/1978 | US4078589 Battery driven screwdriver |
| 01/24/1978 | US4069575 Method and apparatus for preloading a joint |
| 12/27/1977 | US4064772 Tubing wrench with air powered return |
| 12/20/1977 | US4063625 Improved screw or nut runner |
| 12/20/1977 | US4063601 Rotary impact tool |
| 12/13/1977 | US4062389 Screw applicator |
| 11/22/1977 | US4058884 Automatic screw driver system and method for utilizing same |
| 10/04/1977 | US4052652 Apparatus for tightening and releasing a pressure vessel clamping nut |
| 09/27/1977 | US4050141 Track bush turning tool |
| 08/16/1977 | US4042062 Air pulse noise damper for a pneumatic tool |
| 07/19/1977 | US4036692 Nuclear fuel element nut retainer cup |
| 07/12/1977 | US4034574 Universal ball and socket swivel joint |
| 06/07/1977 | US4027561 Hydraulic wrench |
| 06/07/1977 | US4027560 Power wrenches with two point reaction means |
| 05/24/1977 | US4024892 Valve for use in a nut installation tool |
| 05/17/1977 | US4023627 Air shut-off tool |
| 04/26/1977 | US4019589 Pulse motor nut runner |
| 04/19/1977 | US4018292 Power tool with device for preventing unintentional turn-on of drive motor |
| 02/15/1977 | US4007795 Attachment for a rotary-hammer tool |
| 01/25/1977 | US4004859 Air tool with speed responsive shutoff |
| 01/25/1977 | US4004475 Portable wrench for rotary members |
| 01/11/1977 | US4002212 Rotary impact mechanism |
| 01/11/1977 | US4002090 Track bush turning tool |
| 11/23/1976 | US3993145 Power tool |
| 11/09/1976 | US3990407 Explosively powered rotary tool |
| 11/02/1976 | US3989113 Pneumatic tool having a reverse air control valve with an integral regulator |
| 10/26/1976 | US3987692 Tube nut wrench |
| 09/28/1976 | US3982449 Portable power operated pipe wrench |
| 09/14/1976 | US3980909 Universal and D.C. motors with improved field structure for portable tools and appliances |
| 09/14/1976 | US3979977 Power tool |
| 08/31/1976 | US3977278 Automotive electric impact wrench |
| 08/10/1976 | US3973784 Cutting tool adaptor |
| 08/10/1976 | US3973605 Driving tool barrel assembly |
| 08/03/1976 | US3972242 Hydraulic wrench |
| 07/20/1976 | US3970151 Torque responsive motor shutoff for power tool |
| 07/20/1976 | US3970110 Safety inlet air valve control arrangement for air powered hand held tool |
| 06/29/1976 | US3965778 Multi-stage tightening system |
| 06/29/1976 | US3965510 Combination drilling and wrenching tool |
| 06/22/1976 | US3964332 Driver for nuts and screws |
| 06/15/1976 | US3962775 Method of forming a joint using a guide fastener |
| 06/01/1976 | US3960035 Torque responsive speed shifting mechanism for power tool |
| 05/11/1976 | US3955447 Push-pull power wrench for threaded connectors |
| 04/27/1976 | US3952814 Impact wrench |
| 04/20/1976 | US3951217 Impact air wrench having a two position pressure regulator |
| 04/06/1976 | US3948328 Pneumatic impact wrench with torque responsive control |
| 03/16/1976 | US3943800 Portable screw driving tool having screw depth control feature |
| 03/09/1976 | US3942398 Zero torque gear head wrench |
| 01/20/1976 | US3932904 Combination tool |
| 01/06/1976 | US3930776 Hydraulic wrench |